Cadillac head gasket problems. '97 - '99 seems to be the worst choice. #3 · Feb 22, 2010. In fact, most Cadillacs can idle all da Mar 1, 2004 · I have the same problem and my '97 sts seems to run great, no symptoms of a blown head gasket other than the car running hot and pushing coolant out of the overflow tube. May 21, 2019 · Bad Thermostat – The thermostat’s job is to regulate the flow of coolant in and out of your SRX’s engine. Hello, I have been researching the head-gasket problem on the 4. Jun 15, 2012 · Head gasket/block sealer for 99 northstar engine. The gasket kit costs around $275 and the Heli-Coils and tools around $100. To replace the head-gasket you need to remove the motor, and yes, the block does have to be heli-coiled. Measure once, cuss twice, then force it to fit. I'm going to be jumping into the wonderful process of replacing the head gaskets on my 1989 Cadillac and I have a question. Jul 7, 2016 · 89563 posts · Joined 2004. A head gasket sits between a car engine’s cylinder head and block – and should be able to do its job for tens of thousands of miles without a problem. All the anti-freeze is now in the oil. Your real 2002 Deville Touring Sedan is not the later "DTS". '94 Deville has a 4. #10 · Mar 17, 2012. #1 · Mar 1, 2011. Head bolts don't want to come out of the Aluminum block without cracking the Look for the following signs of bad head gasket if you think it’s having problems: 1. 1420 posts · Joined 2006. Over the past year, I have had to keep topping off the coolant. Sep 4, 2008 · I'm 52, so Ive been driving a long time. 6 Northstar engines. 8 posts · Joined 2010. #2 · Aug 8, 2016 (Edited) The 2000 redesign cut way down on the head bolt thread problems. Shit happens. Nov 25, 2014 · 2004 Deville signs of head gasket failure. I own a 1999 Cadillac Eldorado that has a confirmed blown head-gasket. Any recommendations for a mechanic in the Boston area would be appreciated. Yep, if your headgasket goes, coolant and oil will mix in the combustion chambers. My STS ( 180000 miles) is overheating in traffic after driving on the highway with AC on high. Warped block is remotely possible, but head would be more likely. Look for the telltale chalky white dried Dex-Cool. Here's what to look for. I'd say it is definitely possible and after doing much research on it, I'd say it is very likely. a couple months now. Have replaced radiator, thermostat. Oct 7, 2020 · The Cadillac 4. Welcome to CF !!! :highfive: I moved your thread from the incorrect "DTS" forum. Mar 23, 2022 · The good news is that these engine problems aren’t unique to you and your vehicle — but are very common amongst all Cadillac 3. When it refuses to open, the engine can get hot enough that it’ll crack a head or blow a head gasket. I have had leaks here and there - fix one, and then another place pops. Mar 17, 2021 · 319 posts · Joined 2012. This could be due to a bad Aug 18, 2012 · Yes, head gaskets can be successfully and permanently replaced. #1 · Jul 8, 2008. 6 L Northstar) has about 33,000 miles on it and began to overheat on the highway this summer. Please see the sticky thread in Engines; Northstar. You have a low coolant level: If a head gasket leaks, coolant Jun 7, 2021 · 275 posts · Joined 2019. I've owned the car since April 2007. Regular price: $179. This is the first Stsv I have ever heard of blowing a head gasket. #4 · Sep 12, 2016. Sep 26, 2009 · I had a '97 and '98 that both went bad. Nov 17, 2010 · I wanted a Cadillac Dealer, with the best engine techs to do the work, and wanted the best head stud kit installed (SureGrip) to fix forever the head gasket inherent problem in the Northstar 4. When he said that I saw a huge expense. You check for leaks and everything looks good. You should see white smoke out of the tail pipe, white spark plugs, and fouled oil and coolant. This question is about my 87 year old great-aunt's 98 Sedan Deville. #8 · Jun 9, 2021. 1 Liter) has a blown Head gasket. My father had a 2002 Deville with the northstar and his head gaskets failed at 68000 miles. with 4. 6L V8 (LD8/L37) Posted May 14, 2012. Mar 12, 2009 · Seems my 1997 Cadillac Deville d'Elegance has been slowly developing the DREADED HEAD GASKET problem for quite some time now, if I only had known. The gasket may fatigue over time leading to May 8, 2016 · I blew a head gasket before on a 97 Deville Concours and I know it's possible to have one blown without having visible tell tale signs such as white smoke or sweet smell. Aug 8, 2016 · 83940 posts · Joined 2006. Cylinder misfire is another sign of head gasket It will repair the "oil-side" seals while our Head Gasket Repair Kit seals the "coolant-side" seals 8 Cyl. a master technician). 2-coolant gets into the cylinders and you leave a trail of white smoke behind you. Used 1 bottle and followed the directions. I have never worked on a cadillac but a friend is going through a divorce and broke and appears to have blown a head gasket on his car. From then on there is no provision for additional tightening as the head bolts are Nov 29, 2023 · Photo: iStock. #7 · Mar 17, 2021. 2L 2003 CTS. 6L Northstar® Engine (VINs Y, 9 - RPOs LD8, L37) Now that parts are available to correct customer concerns of oil consumption and cold start conditions on these Feb 27, 2014 · 1madstsv. If you need to replace the head gasket, it can easily range from $1,500 to May 21, 2019 · Bad Thermostat – The thermostat’s job is to regulate the flow of coolant in and out of your STS’s engine. If you torqued it correctly and still having problems, then it's time to replace the oil pressure switch. I used to do Chrysler 2. But my '96 is still going at 126,000 miles. 1- exhaust gases blow into the cooling system under load, such as when you climb a hill or pass someone. 99 (includes: Dura-Sealer, Instructions, Liquid-Ice Additive and Extreme Sealer Additive, Free 30 Day Tech. But way fewer is not zero. #4 · Jan 6, 2011. Dec 2, 2005 · Already had the oil changed. 2. #3 · Jan 16, 2005. all need to come off so the gaskets need to be replaced. 9s aren't known for that problem. Remove the coils and ICM, clean the coil base contacts and the coils themselves. headgasket failures from 2000 forward? Nov 17, 2010 · I have my two (2) and the engines have a onetime cure for the problem of the blown head gasket! When and if my other 2001 Deville with only 68,000 miles has a blown head gasket, as I am sure it will happen, there is no question it will be repaired with a 100% fix using the SureGrip Head Stud Kit and have the ride I like for years to come, as Aug 7, 2006 · Head gaskets can be a problem on any aluminum engine. . While a blown head gasket on a 40k engine seems odd; it is six years old. On the other hand we just had a guy report 300K on a '98 with no problems. 0L 3. Even if someone was refilling the car with DexCool instead of the correct green coolant it is highly unlikely that is what caused any problems. You'd actually expect more problems with an old low-miles car than an newer car with average miles, deterioration of gaskets, seals, hoses, etc. On 2000+ car they fixed the brakes, susupension, Apperance, Fuse box, and I can go on and on. Now 13 years later it has a little over 82,000 miles on it. That fire ring is compressed during the assembly torque + degrees bolt tightening procedure - it is NOT flexible. The engine is overheating. Just like Thermagasket you need to flush all coolant first. A faulty head gasket can cause a number of problems with your car. 6 engine owners, no matter which vehicle they drive. 1, 4. I took my wife's DeVille to a radiator shop about 5 months ago and had all hoses, clamps, water pump, thermostat and coolant replaced due to multiple leaks. Jul 14, 2012 · A new engine will not "solve" the problem since all northstars will have headgasket issues sooner or later. I just replaced the water pump due to leaking coolant but now I have a new problem. But all the newer body style devilles, 00+ pretty much were fine all the way to 200k. #1 · Jul 2, 2004. May 14, 2012 · 1. The leak was not severe but gradually getting worse, leaving me stuck in town. 9L engines are not immune to head gasket issues either Google "Cadillac 4. The small valve heads are cast iron but Jul 2, 2004 · 87 Cadillac Seville ,4. Also, I noticed at cold starts its running rough. 6L engine. Feb 8, 2007 · Cadillac addressed many of the issues that caused the head gasket problems for the model year 2000, so your car is much less prone to a head gasket failure. Is the 4. Mar 16, 2012 · 362 posts · Joined 2012. Jul 15, 2020 · 83721 posts · Joined 2006. You most probably DO NOT need a "new" engine. Because the head bolts are torque-to-yield and because there is usually further Jun 23, 2016 · Make sure it's the head gasket before changing it. When it refuses to open, the Oct 1, 2011 · mikellis. 2L engines (RPO L86 and LT1) may have engines built with cylinder head gaskets in which the head gasket stopper ring was off location. Jan 15, 2005 · 9603 posts · Joined 2002. the head bolts lost their grip -. Use only the correct AC Delco #41-950 Platinum spark plugs and the expensive AC Delco wireset - Rock Auto. #8 · Jul 15, 2020. If your engine currently has no head gasket/overheating/exhaust gas in coolant problems then enjoy the car and if it ain't broke, don't fix it. Bad Thermostat – The thermostat’s job is to regulate the flow of coolant in and out of your Escalade’s engine. Coolant leaks are usually from the water pump area, aged heater hose connections and the rad. #2 · Mar 9, 2010. And since issues have been occurring for the past 10 years, it’s given mechanics a chance to study it and analyze countless different cases. DTS Performance models will have the L37. Car Model/Year: 1999 Cadillac Eldorado. Before jumping headlong into a fix or even adding a head gasket sealant, it’s crucial to ensure that the problem is actually the head gasket. So when did cadillac make changes, and what was the approx. These include blown head gaskets, rear main seal leaks, valve cover issues, oil consumption, carbon buildup, and water pump failure. 2000+ engines are far less likely to have a problem, but there are no guarantees. A Failing head gasket at 115K miles is not a problem on the 2007 northstar engines because by 2007 Cadillac switched to better head bolts that allow the head to be removed Feb 23, 2012 · Well, the Northstars in the 2005 Deville and '06+ DTS's are practically the same exact engine. #2 · Jul 8, 2016 (Edited by Moderator) GM lengthened the head bolts in 2000 and then went to a coarser thread pitch in '04. Head gaskets can wear down for a variety of reasons. It's not that the engine is that terribly hard to work on; but it's because Apr 14, 2016 · 2000 DeVille - high temps, possible head gasket leak. After 15k miles its still good - only problem is that to reduce the expansion and contraction I need May 21, 2019 · Low Engine Coolant – If there is not enough coolant to properly cool the engine, it’ll overheat and blow the head gasket. Jun 14, 2015 · Re: 1998 DeVille air intake manifold. ACDelco sealant tabs were used to seal some nuisance leaks that were from gaskets on parts too hard (expensive) to access. loose coolant with no obvious leaks. As far as that gasket kit, the intake gasket, exhaust manifolds etc. Service) This is a Custom Special Formula. 00 with core exchange or remanufactured for $4750. On disassembly, check for cracks and cylinder head warping. This indicates that the coolant has leaked to the point where it can’t effectively cool the engine. You won't really be able to get that much for your car, and if you plan on buying another caddy, plan on another head gasket. 4. There are detailed insights behind those top-level scores Mar 3, 2007 · I recently had success fixing a head gasket problem (huge white smoke screen) on my 1999 Seville STS w/101K miles using Bar's Leaks Head Gasket Repair about $9 a bottle. The aluminum block cylinder head bolt hole threads are the most common cause of failed head gaskets in these engines. Your engine overheats: A faulty head gasket can let coolant into the combustion chamber. while facing the engine it is leaking coolant on the left side now. Share. It suffered from head gasket problems, coolant leaking issues, and oil pump failures. You'll probably want to change the water pump while the motor is out for another $50. firefighterCTS Discussion starter. In this guide we’re going to discuss some of the most common engine problems that affect the Northstar. 9 at about 150k? AutoZone offers Free In-store Pickup for Cadillac Head Gasket. From the time they fixed the head gasket Feb 16, 2020 · 83855 posts · Joined 2006. The most likely culprit would be the head gasket. Apr 20, 2016 · 83940 posts · Joined 2006. Feb 22, 2010 · Ranger. These engines are not known for head gasket issues and like your original suspicion, I agree that the thermostat/water neck area could be the source based on your description of the coolant trail you discovered. The repair involves engine (drivetrain) removal, dissection, engine block head bolt hole machining, steel bolt insert installation, and reassembly. I ran 18/19 psi of boost in my 06 from 65k/95k miles with out any engine issues at all. 3 days ago · The SureGrip Stud Kit for 4. Like. Jan 13, 2007 · I just blew mine in a 96 Deville. the THREADS in the block failed -. Feb 9, 2012 · After researching this forum I came to the conclusion that I too was a victim of the Northstar head gasket/ stud issue. Dec 16, 2010 · Now I've had 99 and lower Seville and Devilles, most developed head gasket issues as low as 70k miles. Jul 7, 2013 · 2003 Deville head gasket blown signs. #1 · Jun 23, 2012 (Edited) I am about to drop $2300 on new head gaskets for my 2008 CTS, and I want to get some sage advice from someone who is very familiar with these vehicles (i. Loss of coolant. White "smoke" (steam) coming from the pipes is not a good sign. I successfully used Thermagasket by RxAuto to fix a leaking head- after an overheating due to broken water pump belt there was a block and or head leak into the engine valley under the intake plenum. 9 head gasket" and you find lost of victims The reason everyone likes the 4. Every now and then a person can luck out and have one last a little longer. Block test performed and shows leak . There was some improvement, but still smoking. Premium Member. The best of the best seem to be the 2004's but even a few of those have failed May 19, 2008 · The Barsleaks is not intended for nor will it repair or prevent a head gasket problem. All this class action recall crying makes me sick. The UV die or a pressure test should aid in finding the source. My car is currently at a GM dealership in Kirkland, WA and I have to get back The head becomes loose on the block when the bolts stay extended and the head compresses. No water. On the 97 the Head Gasket problem seemed to progress and get worse and worse, until after a few weeks I had to keep the heat blasting and windows down, and pull over every 20 minutes to refill the coolant with water. #5 · Sep 3, 2012. Hi All. I have only installed 1 or 2 insterts in 2000+ blocks. Make sure the mechanic thats doing the head gasket knows what he's doing, you don't want to spend 3,000 on a shoddy repair. Gentlemen I own a 2003 deville with 92K on it. 6 NORTHSTAR V8 - PATENT #8,740,532. The engine consists of a full skirted aluminum block with removable steel liners and cast iron crankshaft. Sep 10, 2016 · 527817. low coolant light eventually comes on and engine overheats on steep hills or at traffic delays on hot days . It is part of evolution. Rent an exhaust gas block tester from a parts store, go for a drive, come home and do the block test. The antifreeze burns up in the chamber and exits thru the exhaust. Head bolts don't want to come out of the Aluminum block without cracking the Mar 1, 2011 · 28 posts · Joined 2007. 107 posts · Joined 2014. The head gasket can also blow for this reason. 5 Head Gasket Repair. May 28, 2024 · There are three ways the head gaskets can fail on a Northstar. 2 head gaskets with a lot less miles as if they were free. Otherwise car runs good. 1999 was the "worst" Northstar engine for head bolt failures. It looks as though the hot combustion chamber gases leak past the head gasket into the water jacket around the problem cylinder and cook the head gasket in that area. e. Yeah, I'd take that offer and run. 3- coolant gets in your oil or vice-versa. No amount of sealant will permanently repair a fissure that is constantly growing wider - you must Jul 25, 2013 · Negative. Oct 4, 2023 · Here are eight of the most common indications that your head gasket has failed: An external oil or coolant leak at the seam between the engine block and cylinder head is a sign that you have a head gasket failure or a cracked block. Jun 14, 2010 · I`ve read from massive head gasket problems with the northstart engine. The '05 DHS would have the LD8, which I'm pretty sure difference wise it is the same deal. Long story short, I rented a combustion leak tester and established that there was exhaust leaking into my coolant. Jan 2, 2022 · 20960 posts · Joined 2017. 8 posts · Joined 2012. Low Engine Coolant – If there is not enough coolant to properly cool the engine, it’ll overheat and blow the head gasket. On all the previous engines I've rebuilt they were iron blocks and iron heads, so the head bolts were torque to yield and needed replaced. Many here have much higher milage with no problems. The water pump went out and it was driven hot. A misdiagnosis is a distinct possibility, though I would want more info as to how it was diagnosed. #2 · Apr 21, 2018. Either way, the head will have to come off. Information on Northstar® Engine Mechanical Repairs. He added that changing the head gasket on it is a big job. "Smoke" (if black), rough idle and rich exhaust smell might be a leaky FPR. 1996-2000 Cadillac Concours. It is totally pampered, always parked inside, dealer serviced sooner than regular intervals require Oct 7, 2020 · The Cadillac 4. When new gaskets are installed the head bolts receive a small initial torque, then they get tightened a specific number of degrees of rotation in 3 steps. But serious concerns can involve a head gasket leak too, and it’s one of the more complicated repairs a DIYer can take on. Smooths out within seconds after start-up. Anytime you remove the heads, it is recommended that you insert the block as a precaution (unless you want to gamble and don't mind doing the job twice) and always (per GM) use new head bolts. A leaking head gasket can result in a significant loss of coolant, as it can escape from the sealed passages between the engine block and the cylinder head. 1616 posts · Joined 2010. 5 & 4. Jun 12, 2017 · 4. Apr 14, 2021 · This is a video showing how we repair our Cadillac Northstar engines without using inserts. Jun 23, 2012 · F. This could be due to a bad Jul 31, 2008 · The 4. Proper cooling system maintanence it the best provention, though not a guarantee. If you see your temperature gauge is unusually high or notice a service light, this could be why. Your mechanic checks the cooling system and also finds nothing wrong. Welcome to America. Labor intensive, but the engine is then essentially good forever. We bought this car new for her to replace her 78 Sedan Deville. I was wondering, is it possible to replace the head-gasket Mar 5, 2022 · Consumers reported all sorts of issues with the HT4100 V8. And drove at 100+ every time out with it. Check the common leak points like the surge tank and radiator side tanks. #13 · Oct 1, 2011. I sold my '97 with 107K and never had a problem. 83944 posts · Joined 2006. It's not the head gasket per se- it's the cylinder block head bolt hole threads that fail, causing a loss of clamping pressure and subsequent head gasket failure. 1 Just about every 4. Most likely its the oil cooler on the engine. There is no specific "fix" Over the years there have been a variety of directionally correct changes to the head bolts to increase the integrity of the fastene engagement into the block threads. , Depositphotos . #9 · Apr 23, 2016. I am willing to help but dont want to waste a lot of time and money if it is not fixable. Could be two separate problems. I know when the car was introduced GM had mega problems with the Jun 1, 2007 · It is not a head gasket:rant2: I can only recall 1 or 2 2000+ Northstars with head gasket concerns. Mar 14, 2018 · March 14, 2018. Sure enough the dealer called me saying it was in fact my head gasket. Mar 1, 2011 · 98 Deville blown head gasket question. This push rod motor has a roller lifter camshaft but non-roller rocker arms. Order yours online today and pick up from the store. Asked by jrv in O'Fallon, IL on August 01, 2009. THIS caused the head gaskets to fail -. Aug 25, 2005 · I'm looking to get a 1992 Seville to avoid head gasket and thread bolt problems as well as any unexpected major repairs. Order Now ! Watch Our Video on Explaining Our System! Click Here. The small valve heads are cast iron but Jul 2, 2004 · 3 posts · Joined 2004. I'm going to try the sealant first and if that doesn't work I'm taking my car to CarMax. I have a quick question. this allowed the heads to lift ever so slightly -. I live in Mexico so it's ok. Mar 8, 2010 · CateraMV6. However, it's still crucial that you perform proper coolant maintenance - afterall, the Northstar is an all aluminum engine. 9 was because it has way fewer failures then the 4. If the car is in great shape, like my Deville, I'd say fix it. That is characteristic of head gasket though. 2004 went further with coarser threads on the head bolts. I checked with my mechanic and he said head gasket is leaking and coolant is burning inside the engine. 1 with blown head gasket. Once in town, the temperature rises slowly until I receive the "fluid hot air conditioning off" status message. Adding coolant COULD be just a leak. the problem with the head gasket on earlier northstar engines is that the bolts can't be reused to bolt the head down. The problem is that it is hard to diagnose until it gets really bad. At this point I am going back and forth on whether to get a used engine which I found for $1950. Northstar Dura-Seal® Head & Gasket Kit. Engine: Northstar 4. 4l was designed to fix this problem. 9 more reliable than the Northstar? What are common problems with the 4. The northstar had problems on all years of the engines. The L37 just differs very slightly in output by a few HP between '05 and '06. Nov 28, 2011 · The gaskets that came off my ’97 SLS had the same type of gasket scorching and separation around the cylinders that were leaking. I was hoping someone else may have already experienced it. 2006 -2009 Northstar LC3 Engine Problems: Feb 25, 2006 · FIRST - you must FULLY understand the CAUSE of the failure in the 4. We have been repairing these engines for 15+ years and this has May 21, 2019 · Common Overheating Causes. So what are the signs of a blown head gasket and why does it fail? This expert guide for DIY mechanics will answer all of your questions about how head gasket sealer works, head gasket repair cost and head gasket symptoms. The Northstar Engine has long been deemed the worst head gasket repair job in history by most mechanics and do-it-yourselfers. I started losing coolant with my 1997 Deville with no apparent leaks. 1. From what I've seen they pretty much always fail by 160k at the latest. Just found out that the Head Gasket on my '87 Seville (4. Jan 18, 2024 · Ultimately, the Northstar is not a very reliable nor is it cost friendly. 1994-2005 Cadillac DeVille. Jun 3, 2004 · The main problem is that we're chasing a moving target: the head bolt holes in the cylinder block fail, either from block porosity or coolant/metal corrosion, and that leads to the gasket itself failing due to loss of clamping pressure. Jul 8, 2008 · 70 posts · Joined 2005. Low engine coolant can be both the cause and a symptom of a blown head gasket. Mar 6, 2021 · Submariner409. It isnt overheating yet and I dont see any coolant coming out of the reservoir, checked the oil and no Certain 2016 model year Cadillac Escalade, Escalade ESV, Chevrolet Corvette, GMC Yukon Denali and 2015 Cadillac Escalade ESV, Chevrolet Silverado LD, GMC Sierra LD, and Yukon Denali XL model vehicles equipped with 6. The head bolts where lengthened in 2000 and the thread pitch was coarsened in '04. If you're buying the car, its only worth 800 tops (personally I would only pay 4-500). I've had 2 engine's fail in my 36 years of driving due to a head gasket - one was the original well maintained and driven engine in my '99 ETC, the other was a used replacement engine I had installed that failed 23K miles later. Aug 26, 2007 · 89563 posts · Joined 2004. The Deville name was dropped in 2005 and the "DTS" took over - that car is not a Deville - there are several trim lines within "DTS Dec 9, 2023 · I am at 160K right now with my 2001 Seville, but the head gasket is starting to go. #2 · Jan 3, 2022. Dec 14, 2019 · The head bolts lose clamping pressure, gases blow past the fire ring, and the softer gasket material erodes, causing coolant leaks into the cylinder (s). 9. 89563 posts · Joined 2004. Check out the purge line and the water pump drive belt tensioner pulley. Apr 21, 2018 · 83542 posts · Joined 2006. He went to a GM dealer who repaired the car under my father's extended warranty (which I suggested) due to the problems I had with my 2001 Chevy Malibu's intake manifold gaskets. Ford has huge head gasket problems on some of their V8's and their techs get hosed doing the repairs. 1 failed over the years. I have a head gasket problem at 91K miles on an 3. It is very reliable unless it has been neglected. Cost of Engine replacement, Head repair prohibitive. 1994-2004 Cadillac Seville. Oct 13, 2020 · Factor in additional engine problems that caused the head gasket to blow and that could quickly climb to $5,000, or more. Bad Thermostat – The thermostat’s job is to regulate the flow of coolant in and out of your CTS’s engine. Replacement parts were expensive, and most repair Sep 15, 2015 · My vehicle (99 DeVille 4. Once in a while lightening strikes a low milage car. 6L 2010-2012 Factory Service Repair Manual USB | eBay. Also curious as to whether Northstarperformance actually has the best solution. The root cause was corrected on the 2000+ engines. Here’s one Cadillac SRX 2. This can keep your coolant from circulating adequately, resulting in overheating. Since the head gasket is a major problem that costs alot (relatively) to fix, and renders the car pretty much useless, it kills the value of the car Nov 15, 2009 · Nice work, just get the bolt torqued to proper spec and then your oil pressure problem will likely go away. I've essentially had the entire cooling system replaced; water Oct 1, 2021 · 1997 Deville head gasket leak repair. The other day I noticed the smell of coolant from the exhaust after a cold morning start. Aug 24, 2010 · Replacing head gasket on 1992 4. However, you usually have to get it very hot to cause the head to warp and loose sealing while clamped down. 00 with core exchange. Models: 1994-2002 Cadillac Eldorado. Jan 31, 2005 · The head gasket may be damaged due to corrosion from lack of cooling system service but likely the head and block is fine. Sep 2, 2012 · 89563 posts · Joined 2004. The head bolt threads have been increased slightly and the block thread height was also raised to Nov 13, 2005 · We may earn a commission for products purchased through links on this page Apr 14, 2009 · There are a lot of car companies with worse head gasket issues than Cadillac I can assure you. 8L 3. Aug 1, 2009 · 1998 Cadillac Seville. Consumer Reports rates and ranks cars based on the reliability data collected from members through its large-scale surveys. Northstar head bolts do not get torqued in the usual sense. When the bolts are withdrawn, they must be replaced. I've been told that these motors can't really be repaired,it's best to replace the motor. 4/4. It is to seal any porous aluminum castings or seal a small coolant leak from an imperfect gasket mating surface or such. Use this to make sure the proper coil tower is connected to the proper plug. #3 · Feb 17, 2020. 9 and is not known for head gasket problems. 9 is a well built GM V-8 engine designed for smooth, hi-torque power for full size 3700-4000 lb vehicles. That is enough proof for me that there is a widespread problem. Nov 23, 2009 · The 2002-2003 cars are much more reliable when it comes to head gaskets, but they are not bullet proof. 0/4. Poor Coolant Flow – If there is not enough coolant flowing through the engine, it’ll overheat. This loss of coolant can cause a multitude of problems for your engine, such as overheating, poor performance, and increased wear. Sealant use - muddy coolant in the surge tank, slickery brown goop in the coolant hoses. Re: Head Gasket Repair. #8 · Mar 6, 2021. #3 · Feb 27, 2014. #3 · Aug 26, 2007. Very odd the 4. 6 NORTHSTAR motor -. The threads either corrode or fail due to casting flaws, the head bolt loosens, the gasket fails. At highway speeds, temperature gauge stays vertical. Jan 6, 2011 · 1023 posts · Joined 2009. If the head bolts are detached and used again, the Northstar LH2’s head gasket might also fail. 2L 3. db eq sj is hq tu br by kb zf