Question about 1999 Chevrolet Tahoe

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Leaking antifreeze im leaking antifreeze and i dont know if its the intake gasket or the head gasket and is it ok to mix the dex cool qwith regular antifreeze

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  • jbtahoe Sep 12, 2008

    I have the same problem. my spark plugs are dry but i find antifreeze in the oil. i was told the intake gaskets leaking and i can see a trail on the engine blocks but someone else told me the head gasket may be the problem. my truck doesn't smoke and has plenty of power.

  • ddunlavy Oct 15, 2008

    My coolant level continues to go down, but there is not any visable leak of coolant. I checked my oil and it is very "choclate milk" looking indicating that I have coolant in my oil, but the coolant in the redaitor is NOT contimated with oil. I have been told that the intake manifold gasket is a known issue wth these vehicles, however it is an $800.00 repair. #1 is there any way to seal up the leak without replacing the gasket and #2 how difficult is this a "do it yourself" job?

  • Anonymous Mar 22, 2014

    Antifreeze leaking from exhaust pipe

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Dex cool should not be mixed. Check your manafactures sticker. There is a new type of coolant that works in all, but I think thats for the newer vechs. '05 or so and up.
You could pull a few spark plugs on each side and see if they have coolant and if so then look at a head gasket problem. You can also try a leak down test for head gasket. Also check your engine oil for coolant.
I don't think an in-take gasket would give you a coolant problem, more like running bad or stalling would be more like it.

Posted on Aug 16, 2008

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A quick check you can do to help your troubleshooting is to remove the radiator cap then start the vehicle. (Ensure radiator filled so you can see fluid level). Watch the fluid inside the radiator. Initially after you start the vehicle you will get some small air bubbles but they should go away in less then a minute. If after a couple minutes you have bubbles continually coming up or it starts bubbling out of radiator then you can bet on the Head gasket. If you do not get the bubbles it dosen't rule out either one but if they are there as described then you can look at the head gasket.

Posted on Aug 16, 2008

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1 Answer

Why do i have oil in my antifreeze


Transmission cooler inside the plastic parts of the radiator may be leaking and causing the oil to mix with the coolant. GM also has a problem with their lower intake gaskets leaking, which would allow the oil and coolant to mix. Last possibility is the head gasket is leaking and mixing the oil into the coolant side but not the other way. Check your transmission fluid for mixing evidence. Another thing to do is pressure test your cooling system (Radiator, hoses ect) to see if there is a leak. Another test to try out is compression.

Jul 27, 2014 | 1997 GMC Jimmy

1 Answer

I am leaking coolant from somewhere. when I run my car, the engine smells like hot coolant. I have checked the oil, and the coolant isn't mixing with the oil. I have read about intake manifold...


First, I am assuming that your vehicle is equipped with the 3.1L V-6 and NOT the 3.8L V-6? (Engine size is really nice to know in situations like this!)

It could be any where in the cooling system. The intake gaskets also like to leak externally. A bad intake gasket does not always mix antifreeze with the oil. Take a flashlight and look for coolant on top and/or down each side of the transmission bell housing. This is VERY common on these engines. It may be leaking just enough to where the exhaust crossover pipe is burning it up (and stinking) before it has a chance to run on the ground. Also look for stains on the intake manifold-to block mating surfaces and on the side of the bell housing that will indicate a leak. if your vehicle is still using Dex-Cool, the stains will be pink. If your coolant has been changed to green antifreeze, the stains will usually be real white or dark green depending on the brand and the severity of the leak.

If there are no leaks or stains in this area, then look around the water pump area for the same things. The radiator or coolant hoses (including heater hoses) could also be leaking. If it is stinking when the engine is hot, then you could get it hot then shut if off and look for steam.

TIP: A bright LED flashlight works really good for locating steam.

Jun 18, 2011 | 2002 Pontiac Grand Prix

1 Answer

Hi the engine coolant is low what do I put in there?


Add a 50/50 mix of Dex-Cool antifreeze and distilled water. You can also buy it premixed. If your coolant is low then you more than likely have a leak. You may also have a blown head gasket which is very serious. Symptoms of a blown head gasket are white smoke from the exhaust, loss of coolant with no apparent leak, oil level overfull, a grey foamy substance on the under-side of the oil fill cap.

Apr 24, 2011 | 1998 Chevrolet Blazer

2 Answers

Can you use dex-cool in a 2006 scion xb


dex- cool is the orange coolant, you can use this only if it already has dex -cool, dont mix it with the green type coolant, if it has green coolant you will need to drain it before using dex-cool

Jan 14, 2011 | 2006 Scion xB

1 Answer

What type of anti-freeze is recommended?


Many newer cars from GM require Dex-Cool, but if you read the labels of regular antifreeze, from Prestone, for instance, the warranty is still 5 years and it can mix with any color antifreeze.

I use regular antifreeze vs. Dex-Cool in my 1997 Cadillac Deville and, (knock on wood) haven't had any problems.

I believe that Dex Cool is a little bit more expensive than regular antifreeze.

Use a 50/50 mixture of whatever type you plan to use, though.

Dec 19, 2010 | 2006 Hummer H2

1 Answer

2000 Grand Am GT: My 2000 grand am is leaking antifreez from behinde...


Hate to tell you but it sounds like you have a blown upper or lower intake manifold gasket. This is a very common problem with these cars. I have had mine replaced twice in 150.000 miles. It has been recalled a couple of times 4 or 5 years ago. Its not a cheap fix it ran me about $800 to have them both replaced. If this is found to be the problem when your having it fixed have the garage working on it flush out the complete cooling system of the Dex-col type anti-freeze so it can be filled with regular anti-freeze when there done. Dex-col anti-freeze is the biggest reason these gaskets fail. It eats through and breaks down the gasket over time. But its best to have a garage flush out the system due to the fact the two types of anti-freeze cant be mixed at all or it will turn to a gummy substance and clog up and ruin water pumps , radiators, and heater cores but flushing the system good will keep from any small amount of Dex col being left in the system. In my opinion the regular anti freeze keeps the engine cooler and is twice as cheap not to mention that its gasket friendly

May 18, 2010 | 2000 Pontiac Grand Am GT

1 Answer

I didn't know to put dexa cool antifreeze in my van and i added a gallon of regular antifreeze i can see my fluid coming out pretty fast after driving my van...heater blows intermittently...please help


you cannot mix dex and regular it will cause a gel affect you will need to get a coolant flush and change to regular dex is terrible it will be ok to do so

Dec 22, 2009 | Dodge Caravan Cars & Trucks

2 Answers

I have a 1999 jimmy with 115,000 miles and I,m hearing about the intake manifolds leaking antifreeze what concerns should i have with my jimmy and what type of antifreeze should I be using


A leaking manifold could cost you a VERY expensive repair. I recommend getting it fixed as soon as you can. And with the antifreeze...seeing how it it a GM it should take DEX-COOL. But look under the hood and look for a white sticker and it should say "This vehicle takes DEX-COOL coolant. Do not mix with any other coolant" and if not the cap for the coolant should say so. If so, then obviously you need DEX-COOL or universal coolant. Universal will not harm anything, but I would use the manufacters reccommendations just on the safe side.

Oct 19, 2009 | 1999 GMC Jimmy

1 Answer

2003 Pontiac Montana antifreeze smell?


Bad News. I recently had the same type of smell ( no leaks or puddles either) coming from my van and had to have the intake manifold gasket replaced due to the Dex-cool issue. It appears GM installed an inadequate/substandard gasket when they built the van. My van only had 65,000 miles on it. There's a Dex-cool settlement you could have applied for but repairs had to be made by May of 2008.

This is the only real complaint I've had with the van.

Dec 09, 2008 | 2003 Pontiac Montana

12 Answers

OIL IN ANTIFREEZE


Everyone automatically assumes that oil and water mixing means a blown head gasket or cracked engine block. Of course common sense is usually not that common. Oil in coolant is a different problem than coolant in oil. The former is a low pressure leak, and could indicate only an intake manifold gasket. It could also be an early or small head gasket leak. Coolant in oil is usually a cracked block or torn head gasket, and has concomitant symptoms of white exhaust smoke and milky oil on dipstick. If you replace the head gasket and the problem persists, an intake gasket could have fixed the problem.

Jun 27, 2008 | 1999 Saturn SL

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