Last post on Jul 19, 2010 at 5:40 PM
You are in the Chevrolet Suburban & Tahoe
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Chevrolet Tahoe, Chevrolet Tahoe Limited/Z71, SUV
#12 of 28 Low coolant in 2004 Tahoe
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?
#13 of 28 Re: Low coolant in 2004 Tahoe [fdc629]
Sep 20, 2007 (12:24 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 28 Worse thing to put in your car ........
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 28 loosing antifreeze......
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 28 Yukon leaking coolant too...
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 28 Tahoe Cooling System
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 28 Coolant leak
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.
#19 of 28 05 Tahoe LT coolant leak into Engin.
Jan 06, 2010 (7:48 pm)
I just add about 1/2 gallon fo coolant every month. Took it to dealer and they could not find any leeks anywhere. They did however say they had a service bulliten on how to fix the internal engin leak. They said to keep putting in 1/2 gallon of coolant per month. It is cheaper than the fix. I did replaced water pump last year, the 2005 LT has 96K miles, so this coolant leak is the second problem I have had in five years..
#20 of 28 Re: Coolant ALWAYS gone! [rockman59]
Mar 31, 2010 (6:46 am)
I had a 99 silverado with the 5.7 engine. I discovered that it had the plastic intake manifold gasket which after about 60k it would warp and begin leaking at the rear of the engine, behind the distributor. I put in some block sealer because the dealership wanted $350 to replace the gasket. It never leaked again. Hope this helps.
Jun 26, 2010 (6:09 pm)
Like yourselves, I too own a 04 Chevy Tahoe. For several years I've enjoyed the luxury of having my truck dig into my pocket for the purchases of the Dexcool coolant that was recommended. I too would wake up most mornings and have the pleasure of waking my neighbors to the sound of the cold crank knocks that it provided. Several months ago I noticed that coolant would disappear from the resevoir mysteriously after having been filled the day prior. Took the truck to the dealer to have a "professional mechanic" take a look at it to see what was causing the coolant to disappear and find out where it was going. They pressurized the radiator, scoped the engine, replaced the water pump and said that they weren't able to detect a problem. 6months later of the same problemI am now having to replace the engine! Thanks alot Dexcool and the Chevy/ GM Professional Mechanics out there who supposedly train on the engines and who are out to take advantage of all of the loyal chevy/gm drivers out there.