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Tahoe Coolant ALWAYS gone!

18 messages,  Last post on Nov 13, 2009 at 5:21 AM

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What is this discussion about? Chevrolet Tahoe, Chevrolet Tahoe Limited/Z71, SUV

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#9 of 18 Strange Leak by tivy Mar 24, 2007 (7:08 pm)
I replaced my head gaskets trying to get rid of a coolant leak. That fixed it for like a month and it started again. I added a bottle of bar’s leak and all has been well for 50,000 miles. From what I gather these things have leaky heads and need a sealant. I think bar’s leak, or something like it comes installed form the factory.
#10 of 18 Re: Coolant ALWAYS gone! [montnut] by immrchevvy Mar 27, 2007 (6:16 am)
Replying to: montnut (Feb 22, 2007 10:27 am) The problem is the intake manifold gasket, usually on the drivers side between the back 2 cylinders.
#11 of 18 AC Compressor short-cycling by truckin4x497 Jul 22, 2007 (3:37 pm)
I have a 1997 Tahoe and just this year I noticed the compressor is short cycling. Car parts place suggested it might be low refigerant, so I check and tried to put some in, but the guage said it was full? Any suggestions?
#12 of 18 Low coolant in 2004 Tahoe by fdc629 Sep 20, 2007 (12:08 pm)
I have a 04 Tahoe LT, i noticed my coolant was low over a month ago, i went out and purchased the dexcool coolant that was recommended by chevy. I mixed it and filled the reservoir i didn't use the whole bottle. Today i noticed it was low again, not empty just low, so i mixed the coolant with water and filled the tank again. I still have some coolant left in the bottle that i bought over a month ago, and i've been checking for leaks under the truck before i drive off anywhere. I haven't seen anything on the ground whereever i park. Does anyone have any suggestions? Replies to this message: kiawah (Sep 20, 2007 12:24 pm)
#13 of 18 Re: Low coolant in 2004 Tahoe [fdc629] by kiawah Sep 20, 2007 (12:24 pm)
Replying to: fdc629 (Sep 20, 2007 12:08 pm) It's normally a closed system, so you should never have to fill it unless there is something wrong. You obviously have something wrong.   It's hopefully leaking out (water pump shaft, hose fitting, cracked overflow tank, etc), or you may have a problem where your engine head gasket blew out and it's sucking coolant into an engine cylinder and out the exhaust pipe (not a good thing to have water in the engine).   You've got to quickly find the leak. If you don't find it externally to the engine, then I'd take the engine to have a compression test done on all the cylinders.   Could also be leaking from the heater core (carpet wet by any chance front passenger), or rear aux.
#14 of 18 Worse thing to put in your car ........ by mcgyver Aug 19, 2009 (5:31 pm)
The worst product on the market to use is Dexcool. It destroys the inside of a motor, heater core, water pump, radiator, freeze plugs and all associated with it. This is what eats the intake gaskets and if you smell anti-freeze but can't find the leak, guess where it is? GM recommends it and you wonder why.... it gives them service business after the warranty is over. If you have it in your system, flush it well and replace it with a good glycol type coolant that has been around for years and won't damage your vehicle. Don't believe me, then go ask any reputable independent shop what Dexcool will do to your car. It is like Coke in an empty stomach, a disaster!   If you have to have your intake gaskets replaced, don't use GM but the better FelPro gaskets if you want reliability.
#15 of 18 loosing antifreeze...... by sox10 Oct 14, 2009 (8:27 pm)
i had the same problem in a Venture minivan. check your oil and see if it looks like a milky way candy bar....you know swirls.....if so i had to replace a head gasket...
#16 of 18 Yukon leaking coolant too... by jiver Oct 19, 2009 (9:33 am)
I'm having the same problem with an '03 Yukon XL I recently bought used. I've put in two gallons of the mix in the past two months. No external leak apparent. Just took it into a shop recommended on Car Talk - they can't find anything after a pressure test and checking the oil and doing another analysis to determine whether it's an intake gasket. They recommended to keep driving it and bring it in if it gets worse, but there's no for sure sign now of a gasket problem.   Any suggestions? I like this idea of putting the Bar's Leak in...
#17 of 18 Tahoe Cooling System by jgibson111 Nov 12, 2009 (3:11 pm)
Had a leak so I bought a radiator from Radiator.com. installed it, no problems. Now the tahoe is overheating. I have changed the thermostat also, no help. What is next?
#18 of 18 Coolant leak by jiver Nov 13, 2009 (5:21 am)
This may help:   I have a 2003 Yukon XL and had been putting a gallon of coolant mix in every month. Took it to the shop and they pressure tested it and couldn't find anything wrong. I did some more research and found that it can often be a gasket in the water pump - took it back in, and that was it. Same labor to replace the pump as to just do the gasket, so $450 later and everything appears to be hunky dory.   Here's more information.

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