DexCool in GM Engines
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DexCool in GM Engines

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Last updated: Dec. 30, 2017

768 DexCool in GM Engines Consumer Reviews and Complaints

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Verified Reviewer
Original review: Dec. 30, 2017

Recently replaced coolant, DexCool in my 2003 GMC 1500 Sierra 4.8, 2wd. No sludge. Color was still pretty good. I tested the heat and coolant resistant on the stuff I was replacing on the way out, and it was way above requirements. I did not test the ph level with test strips so I do not know that. I've never had any issues with overheating or any related repairs to the engine. No gaskets, no nothing. I bought the truck used with 59,000 miles from one female owner who took great care of the vehicle. I now have 181,000 miles. I live in the mountains, 5,000 ft, of West Texas, 100 miles east of El Paso in the Chihuahua Desert. I drive on lots of dirt/muddy roads, in extreme weather, monsoon rains, 90 to 100 degrees regularly. Very satisfied with what I saw and hold the vehicle held up so far. Will be changing coolant once a year from now on. Heard that if the coolant gets too acidic, it could corrode the aluminum parts in the engine.

Love the LS engine and this GMC truck. Have a '99 Silverado too, 175,00 miles. Three times I had to drive through flood waters with water over the top of my hood for around 30 seconds or more, 50 to 100 feet, in monsoon rains, and had no damage that caused any failures to my GMC truck. And I have put many thousands of miles on since. Zero issues. Real life miracle to me. So impressed, I'm thinking of putting a snorkel on the truck and do some other things to the electrical to seal. Sorry for the tangent, but wanted to put that info out because it is incredible and true. With regards to the DexCool, no issues, held up great, so I'm going to stick with it, and change it more often.

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Verified Reviewer
Original review: Oct. 25, 2017

I have a 2006 Pontiac Gran Prix GT that had DexCool antifreeze in it which is recommended for GM cars. I have heavy pink sludge in water pump, radiator etc. Already have had to replace water pump, thermostat, radiator etc. Why is this used knowing it can destroy vehicles??? Are the lawsuits still going on? These repairs are costing me a lot!! Live on ss and husband passed away just 2 months ago!! How do I afford all this?? Feeling really angry!!

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Verified Reviewer
Original review: May 7, 2017

I have bought a 2000 Oldsmobile Intrigue GLS back in 2014, I didn't have any trouble with it until this past Christmas in 2016. I had major leaking from head gaskets and water pump that have damaged my alternator. That repair was 320.00. Now to fix the water pump and head gaskets will cost 6-700.00. I don't have that money right now. I'm leaking oil and coolant. Ugh. I just found out that GM settled this DexCool lawsuit back in 2008 way before I bought this car. Is there a way to get my car fixed through them for free, or low cost since it's more likely from DexCool. I read that water pumps and head gaskets went bad due to DexCool. Any help would be great. Thanks!

Verified Reviewer
Original review: March 17, 2017

I have a 2013 Chevrolet Sonic RS. My car has just reached 60 thousand miles. In 2015 the hoses that go to my heater core randomly exploded with no warning of overheating or anything. That was a 300 dollar fix at the dealership because they are not considered a warranty item. In late 2016 my upper heater hose swelled up like a balloon, and then burst, another 150 dollar repair.

In January of 2017 my coolant overflow tank started to get random pinholes throughout the side and bottom. A part that looks like a thick plastic tank was no match for Dex-Cool, there was another 80 dollars to replace myself. But to top it off, March 2017 as I thought all my coolant issues were resolved I now have a thermostat that has frozen shut, thankfully I was able to fix this myself so it only cost the 30 dollars for the part. I'm just waiting for my radiator to blow next! So thank you Chevrolet for making the worst coolant system I have ever seen. Might I add my 89 Chevy Truck with 210000 miles has never had a coolant issue but doesn't use Dex-cool. I have receipts and shop bills from every purchase, I will gladly share those if and when the time comes.

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Original review: Feb. 11, 2017

I hope I'm not beating a dead horse, but I've never had a coolant leak and way under 150k miles in my 2001 Chevy Silverado. Now from time to time the low coolant light came on and I would just purchase that manufacturers recommended orange Dex-Cool and top it off. I've always lived very close to work and have only taken this truck on a couple of long trips each less than 500 miles in distance.

That said this week I found a large pool under my truck. Initially I thought it was transmission fluid due to the reddish orange color not realizing it then that tranny fluid is red. Anyhow I'm not looking for keyboard mechanics to tell me I should have done this or that kind of comment but I really need to know was there a legit recall I could use to address this issue or is GM just shrugging their shoulders and saying ** the little guy? Any factual information pertaining to this Dex-Cool crud I was informed to use would be helpful. Thanks again and not looking forward to these repairs.

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Verified Reviewer Verified Buyer
Original review: Dec. 9, 2016

In 1996, my father, the late Charles **, purchased a 1996 Chevrolet S10 pickup truck with the 4.3 liter v6 motor. Unbeknownst to me, there was a product recall in the year 2008 due to major damages to said engine caused by the "required coolant", DexCool, which was specifically created, supposedly, for GM engines. The reason for the recall was ruined radiators due to weird orange-brown sludge with a rusty appearance that clogged up the vehicle's cooling system, failed head gaskets and other major repairs caused directly by DexCool. My father was one of those people who bordered on being obsessive about following recommended manufacturer's instructions about vehicle maintenance.

In 2001, my father passed away and I inherited this vehicle. From time to time, it would overheat, then apparently temporarily correct itself. As time progressed, the problem continued to worsen, until the vehicle would severely overheat. Finally, out of desperation, I took it to a mechanic. He replaced the thermostat. That worked for a while, but the problems worsened. A mechanic then suggested I replace the radiator, which I did. This seemed to solve the problem. For a while, it did. After another year or two the problem was back in full force. Now once again after another 3 years I am running into the same issue. The truck overheats and I have to pull off and let it cool down before I continue to travel.

In 2008, GM offered a settlement for a class-action lawsuit pertaining to the aforementioned damage to affected vehicles. Even this is not satisfactory. The problem continues. As does the damage due to this noxious chemical 'coolant'. Apparently, I am far from the only one with this issue. The case needs to be reopened and offer a real solution to people who have incurred large outlays of cash. These are very expensive repairs. Some people have had to replace their head gasket. I don't know if that's what's in store for me or not. I'm very angry, and I know my father would have been very unhappy as well.

What can I do, I'm very low on funds. GM should be held completely responsible for their actions and the product that caused all the damages. In addition, in order to dodge payments that were required to settle the lawsuit in 2008, this same company declared bankruptcy in 2009 so as not to have to follow up and remedy the owners' problems. Thank you in advance for any assistance you may be able to render me. I have now replaced 2 radiators and 3 thermostats since obtaining dad's truck. I will never purchase a new GM vehicle, if this is what passes for customer 'service'.

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Verified Buyer
Original review: April 26, 2016

Same problems with DexCool 4 year old car with less than 14000 miles and coolant is brown instead of red and foul odor inside car. Dealership has same shoe box answer that GM has no problems with Dexcool want me to spend $400 on a new cabin air filter and reprogram car computer so fan runs longer. They also said it might fix problem no guarantees. Why should I have to pay for a reprogram when GM has created the problem. Other forums say the smell comes from heater hoses breaking down on the inside thus causing a foul dead animal smell in car.

Verified Reviewer
Original review: April 17, 2016

I have a 2000 Silverado 1500 Z71 with 5.3 L and 165000 miles that I inherited from my brother about 6 years ago. He bought used in 2006, then has regular antifreeze in it. I'm not sure who put the regular antifreeze in it to begin with, since my brother isn't living and I can't ask, but my radiator and engine doesn't have rust or sludge. I can say my truck overheated from a malfunctioning thermostat about 4 1/2 yrs. ago and I replaced the thermostat and added the 50/50 antifreeze. I did not see any rust anywhere. So, as for the DexCool, I don't know, but I do know my brother was a diesel mechanic, so either he removed the DexCool or GM did. Whomever it was did the right thing because I do not have rust or sludge.

I also have to say I have been a Shadetree mechanic for 30 yrs. and have used distilled water in my radiators for at least 25 yrs., after replacing a radiator and water pump due to rust and failure. Since I started using the distilled water instead of tap water, I have never had rust show up in my radiator water nor have I had to replace a radiator due to clogging. I also only replace my antifreeze every 3 or 4 yrs. So as for old coolant causing problems I think that's crazy.

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Verified Reviewer
Original review: Dec. 11, 2015

Intake manifold gasket failed after 12,006 miles on my new 1998 Chevy 454 engine, moho. Called dealer, was told that they were pulling all DexCool from these engines due to intake manifold failures due to the long term DexCool coolant. Since I was over the warranty mileage I was on my own. I replaced the intake manifold gasket, installed standard coolant. I now have 125k miles and 17 years with no further problems. 10 years ago I purchased a 96 Eldorado with the Northstar engine, 75k miles. I had to rod out the radiator, remove the DexCool, replace the water pump, replace the thermostat and install green coolant. 145k miles now. No further cooling problems. 94 Chevy 2500 truck 350, green coolant, 175k, no problems. I won't put DexCool in any engine I own.

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Verified Reviewer
Original review: June 1, 2015

In July of 2014 I had my 2000 Pontiac Firebird radiator flushed due to the DexCool being a brown rust color. Recently I had my oil changed and the mechanic recommended I have a coolant flush and that it was really bad. My question is: Is it normal for the DexCool to turn brown and rusty looking and will it harm my vehicle?

Original review: April 1, 2015

My 1994 Firebird will leak between the block and the coolant intake behind the water pump after a couple/3 years, because the remnants of old Dexcool continue to make the Peak antifreeze look dirty and eat the manifold gasket. Annual cooling system flushes and a radiator replacement haven't prevented this gasket leak, and I am removing the power steering bolts and other accessories and brackets to replace the gasket yet again. I will continue to use the green ethylene-glycol 50/50 antifreeze and hope that this time will be the last time that old Dexcool contamination in the block is constituted at a harmful enough level to attack the gasket.

Verified Reviewer
Original review: March 22, 2015

I have a 97 S10 that has had ALL recommended service intervals done when required, which included changing the antifreeze. At 191,000 miles, the engine went into overheat rapidly and was towed to a shop where it was discovered it had a blown head gasket. It also had a 40% clogged radiator, rust and sludge in the engine block, etc. DEX is the cause of this, according to my ASE certified mechanic. I don't know where GM engineers learned their trade, but it was definitely not at Georgia Tech, because you see at Tech, we were trained to look for causative factors. Since this DEX problem seems to be very prevalent in GM cars, to deny it is akin to a total lack of veracity on GM's part.

Original review: Feb. 26, 2015

I just bought a 2003 buick park avenue ultra back in october. Since then I noticed my car would overheat when the heater wasn't on. I thought it was from driving the engine too hard so I changed the oil and checked the fluids. Me being a mechanic in training could not detect an immediate problem so I drove it as normal until back in December of 2014 the car overheated on the highway!! I later took the car to my dad to have it looked at. Upon examination he told me I had a broken intake manifold, he having had a buick park avenue had the same problem with his car! So I figured I could save up money to have it professionally repaired. However due to other financial difficulties I had to put it off. But suddenly last monday my car started smoking under the hood. I went to a buick dealership to have them look at it but they refused to even look at it!!

So I went online to look up how to repair it myself and I came across numerous articles about other park avenues having the same problem as well as other GM cars with the same engine! And guess what they all had in common, DEXCOOL!!! That stuff has been destroys thousands of GM cars including my Dad's park avenue! I checked the service history and the car having been serviced at a buick dealership its whole life thus meaning DexCool was the fluid used to service the coolant system! I've currently checked the car's coolant tank and have noted DexCool inside the tank prior to the car's last service. I'm angry at both GM and DexCool, and I'm shocked and appalled at how careless, stupid and inconsiderate they are!

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Verified Reviewer
Original review: Feb. 24, 2015

I have a 2001 Chevy Lumina and the intake gasket has to be replaced because the Dex-cool coolant eats away at the intake gasket. Many people have had the same problem and I'm positive I wont get another Lumina again.

Verified Reviewer
Original review: Feb. 15, 2015

Got the car from my girlfriend's grandpa. It is a 1997 Buick Lesabre 3.8L, had dex-cool in it, and I asked her brother, "Is this stuff good?" He said yes it's supposed to be in there. Well finally one morning, I was driving and BOWWWWW BOOOM. I thought to myself, what in the hell was that? I got home and the battery gauge went to 8 very quick then had no power steering. Well lucky I was almost home so I parked it and popped the hood. To my surprise, the whole pulley from the water pump came off just sheerd off I had dexcool in the car and before this happen, Buick had said my pump was leaking an intake was as well so they did the work and put dex-cool back in there. I got home, drained it all out, flushed it, and put real stuff in there. Prestone never will that dex crap go in my car. Crap. Stay away.

Verified Reviewer
Original review: Jan. 21, 2015

I currently own a 1996 Pontiac Grand Am which has had numerous problems concerning the dex cool antifreeze. I have had to replace the manifold gaskets twice on this vehicle, and the water pump twice also. I had my system flushed out numerous times which also included a new radiator and also the valve cover gaskets as well as new thermostats 4 times because of over heating. The mechanics all told me there is sludge from the engine that is clogging up my system due to the dex cool. I did contact the Garden City Group in Dublin Ohio in May of 2009. At that time I submitted my bills for these items and to this day I have not heard from them at all.

Verified Reviewer
Original review: Dec. 2, 2014

In 2011 I bought a 2000 S10 for $500 w/ 74,000 miles and a cracked engine and a big hole in the radiator. To be fair, the previous owner HARDLY EVER serviced it. She called me crying "There's smoke and steam pouring out from under the the hood!" I bought a NEW -- not reman -- engine from G.M. and installed it along w/ other new parts (I'm a retired import tech). After 2 trips to N.Y. from FL. (6000 miles) the engine lost ALL oil pressure! This was due to improperly installed camshaft bearings. The dealer's only legal obligation was to provide me with a new engine. However G.M. (after seeing I installed the 1st engine correctly) paid for the labor. They told me specifically to use Dex-cool or risk voiding my warranty (3 yrs - 100,000 miles). Now, to be fair, I'm 1 of those CRAZY people who drains and refills my cooling systems w/ a 50/50 mix of coolant and DISTILLED (NOT TAP) water EVERY year. As a retired tech I'd recommend you do the same (and learn to do it yourself, it's not that hard). That way, the coolant that's in your engine is never more than a year old and rust and corrosion NEVER have a chance to form (and Dex-cool NEVER has a chance to gel or harden up). In my 30+ yrs 5 yrs -- 150,000 miles on ANY coolant is a fairy tale.

Original review: Oct. 30, 2014

I have a 2006 Pontiac Torrent and love it. Bought used with 40k and now have 170k on it. Well maintained. Leaking coolant and have read several sites about GM gaskets and Dex-cool. So... went to dealer. They are aware but nothing can be done. Hmmm, leaking coolant and dealer see bad head gasket. I ASKED IF ANYTHING ELSE IS WRONG OR SHOULD BE DONE at this time. They looked it over… all good. RIGHT. Week later it’s leaking - this time manifold gasket. Now who pays the price - the dealership not sure me again because same plus labor plus new gasket… Again they just replaced last week. That was a $1100 bill. Pissed off. Oh yeah… any suggestions?? Dealer not given me an answer on this yet. Pending lawsuits out there? I keep receipts.

Original review: Aug. 31, 2014

My 97 Chevy SILVERADO sat for 4 years without cranking. Transmission broke and couldn't fix it due to finances. Had engine completely over hauled 6 years ago at 217,000 miles due to gaskets leaking. Engine looked BRAND new inside. Of course I only will use Castrol oil in it and the name brand lubricants and fluids and I change everything routinely, including flushing Radiator/engine block every 2 years. Transmission broke at 242,517 miles. The other night I changed the oil from it sitting 4 yrs, turned the crank by hand, looked at radiator, dexcool looked great, webby - to drain the gas tank because it has half a tank of 93 octane NON-ETHANOL GAS with four bottles of Stabil gas stabilizer. I said what the heck...I then bumped the ignition switch, starter engaged, and the Engine fired right up. I left it running over an hour allowing thermostat to open and checked for leaks. No leaks and no dry rotted hoses or belt. I am amazed!

However I will still flush all the old coolant and replace with new DEXCOOL & Distilled water. The key to me for a long lasting engine is over the top maintenance and using dependable name brand lubricants and fluids. Plus never ever run ethanol gas in anything older than about 2004 unless the manufacture states otherwise. I have no complaints here except it taking me too long to be able to afford a new transmission due to health reasons.

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Original review: June 7, 2014

Bought a 1997 monte carlo in 2002 from original owners. Only had 70,000 miles on it but within months of buying it had to replace intake manifold gasket. Then within probably 4 years had to have same thing done due to dex-cool antifreeze. Now have a 2002 Pontiac Grand Prix with a little over 110,000 miles on it and having same problem with it.

Verified Reviewer
Original review: June 2, 2014

2000 s10 Blazer, one owner, 98000 miles. 2007, at 66000 miles, heater core plugged. Radiator looked gunked up. Flushed system and went green peak anti freeze. Ended up changing radiator and heater core due to leaks. Now have rear intake gasket leak. Have 91 Silverado, replaced engine in 2001, cracked oil rings. Had 87 Astro. Changed engines, cracked oil rings. Coworker, 87 c1500 changed engines, oil burning, probably same thing. Brother, 88 Astro Jayco package, bought new, warranty just expired. Cracked oil rings. Changed engines. I also have 2004 Trailblazer with 130000 miles. Engine still seems good but burnt tranny fluid and changed ignition switch twice. GM quit making quality cars in the early 80s. Sorry GM. Won't buy another unless it comes with a lifetime bumper to bumper guarantee.

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Verified Reviewer
Original review: May 3, 2014

My 2001 camaro. I got it brand new, and have had nothing but problems with it. It has always ran at 190 degrees or more and had many repairs. I am the only driver and my kids say I treat it better than them. I just now have 60,000 on it and it's broke down again.

Verified Reviewer
Original review: Dec. 29, 2013

Bought a Silverado used not long started having trouble with heater. Now I learn about the Dex-Cool problems and intake gasket problem.

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Verified Reviewer
Original review: Dec. 22, 2013

I brought my first brand new car 2005 Chevy Equinox at around 15000 miles had to have new rotors and brake completely redone. Then about 50,000 miles, had to have the head gasket replaced due to overheating. It has never ran good since. Now at 80,000 miles, it is overheating again and to be honest, I am about ready to take a sledge hammer to it and I am just taking about the major thing. I have driven beaters my whole life and have driven them into the ground and never had so much problems as I have had with this car!!!! Now I am sitting here trying to scramble around and borrow a car to get to work :( And shaking my head. I will probably never be able to buy another brand new car. Guess I will go back to driving a beater. Don't buy a Lemonox 2005, it will bring you to tears.

Verified Reviewer
Original review: Oct. 23, 2013

I have a 2002 Chevy Cavalier, um, it's the coolant... Blown head gasket radiator. I'm debating right now to junk or fix.... I have the parts but the labor. As soon as I put the coolant that night, it was running hot over 200.

Verified Reviewer
Original review: Oct. 14, 2013

My beloved 1999 Chevy Venture van with 3.4 V6 engine failed on April 18, 2013 at 152,850 miles. It experienced sudden loss of power in construction zone on I-57 near Chicago and was towed in. Spark plugs and wires were recent so mechanic checked for lack of fuel problem and ruled that out. Venture was started and engine and it shook violently and was diagnosed as lower engine failure. Due to blown intake manifold gasket failure which allowed antifreeze into the engine oil, which attacked bearings and ruined lubrication of the engine oil; which ruined bearings where piston rods attach to crankshaft. Mechanic said he had seen many blown intake manifold problems with Chevrolet 3.4 V6 and other Chevy engines and problems are publicized all over the Internet, as well as problems with DEX-COOL.

I went online and was shocked to learn the extent of financial loss to so many GM and Chevy owners. HAD I KNOWN about this issue, I would not have invested in a rebuilt transmission and new radiator 5 months earlier. On Dec 24, 2012 at 151,326 miles, transmission failed on I-65 near Chicago and was towed in. Failure due to 50% restriction in radiator ATF cooling tubes. Transmission rebuilt and radiator replaced at cost of $2,889. On June 7 2012 at 148,564 miles, engine was losing coolant so intake manifold gasket was replaced at cost of $724. On Oct 10, 2010 at 139,196 transmission rebuilt due to hard shifting at cost of $1,392. On Sept 24, 2010 at 138,397 miles engine was overheating, so cooling system flushed and refilled with DEX-COOL at cost of $145.58. On April 19, 2002 at 68,435 miles, intake-manifold gasket replaced first time at cost of $701. On Jan 25, 1999, we purchased Chevy Venture van, took good care of it and expected engine to reach 200,000 miles.

I took good care of my Venture and expected engine to make 200,000 miles with no problems. Additional repairs listed: New plug wires at 152,389 cost $201. New muffler at 151,889 cost $96. Throttle body repair at 151,009 cost $175. New front brakes at 149,354 cost $150. Headlight at 145,982 cost $246. Two tires at 141,061 cost $139. New spark plugs at 134,499 cost $150. Oil changes at 151.012-148,546-145,140-138,053-135,356-132,083. Please publish address of where to send my documentation so executives at GM, Chevy, DEX-COOL know about turmoil and financial loss of poorly-engineered intake manifold gaskets and DEX-COOL antifreeze. I hope to get in on next class-action lawsuit.

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Original review: May 21, 2013

GM 3800 Motor - Everyone should have been notified of this problem. My only means of transportation burned to the ground because of this Dex-cool / manifold problem. I bought this car brand new off the lot (quite a few years ago) but was never notified of any sort of problems like this. Now, not only did I lose my transportation, but I have some home damage as well. Spontaneous combustion is what it seemed like, right in my garage. GM should own up to this.

Original review: May 17, 2013

The intake gasket on my van which is a 1999 Chevy Venture failed and the head gasket failed three times.

Original review: March 20, 2013

I took my SUV in for service in October 2012 and I was told that I needed to replace head gaskets. I contacted GM Customer Service. I was given a case number and referred to a local dealership. After taking the SUV in, they told me and my brother-in-law that I didn't need a head gasket but replace the antifreeze and they charged me. When I noticed that the engine light is on again and the antifreeze was leaking again, I contacted the same dealership. I took it in and was told that now I need head gaskets. I contacted GM again in March 2013 and was given another case no. I was told they would check into the matter. Today, I was told they couldn't help me. General Motors and that Chevy dealership should have repaired that head gasket the first time. The model has been a problem for many car owners with complaints of replacing the head gaskets because of the coolant Dexcool used!

Original review: Dec. 15, 2012

I also have the whole Dex-Cool issue. I'm not sure if I have the gasket issue yet (I sure as hell hope not). But I've noticed the sludge in my radiator. But for everybody that hasn't been completely screwed or those of you that have but don't know what to do, flush your system fully and go back to the ethylene glycol coolant we all know and love. It will work the same without all the major damages.

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