Last post on Oct 15, 2013 at 5:24 AM
You are in the Chevrolet Suburban & Tahoe
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Chevrolet Suburban, Chevrolet Tahoe Limited/Z71, Engine, SUV
#15 of 29 Re: 01 Chevy Suburban loosing coolant [bena8837]
Jan 18, 2011 (1:27 pm)
I have the same issue with my 2004 suburban I was told the 5.3 came through with heads that were poorly casted and they developed cracks around 100,000 mi. Sure enough mine started drinking antifreeze at about 105,000 I was told the best remedy is that spending 3000 dollars on a new motor makes more sense than 2,400 on new heads for an old motor. That said, I bought two bottles of " steel seal " for 85 dollars to see how much more I can get out if this motor. I'm at 119,000 Miles and counting , not using any antifreeze and the tailpipe is dry ( knocking on wood right now ). One thing I did is un-hook the heater hoses so as not to plug the heater cores when I ran the sealant through the motor.
#16 of 29 Re: Suburban 5.3L coolant leak into engine [immrchevvy]
Feb 09, 2011 (5:40 pm)
I had this exact problem on an '03 Suburban. It cost me ~$2300 to replace the 2 heads at 88K miles. In hind site a complete enginer replacement may have been the way to go, although I expect that the labor costs would have been much higher. GM customer service was useless. It is difficult to understand how a know design/manufacturing defect is not a recall issue. That is the last GM product I'll ever own.
#17 of 29 Tahoe 5.3L coolant leak
Jul 23, 2011 (7:15 am)
My 2003 Tahoe Z71 with about 116K miles now, has had a coolant leak for the last few years.
I've considered taking off the skid plate to try to visualize the source, as there's a small puddle - maybe an ounce of fluid - on the driveway or garage floor some hours after driving. I had it checked at a trusted garage, and the owner said that when pressurized (from driving) coolant can 'weep' from around the head gasket. He couldn't find anything. Its not getting in the oil and so far its only a mild nuisance. I just keep a bottle of coolant in the car when on long trips, and refill as needed every month or so. I can't afford major repairs, so for the cost of a couple gallons of antifreeze a year, I'll just keep on trucking.
#18 of 29 Re: Suburban 5.3L coolant leak into engine [gainer]
Feb 01, 2012 (5:57 pm)
I am reading these posts with great interest. I have a 2002 Suburban. It has 181,000 miles and has never been a problem - until now. It just started leaking coolant two weeks ago. I took it to my trusted mechanic, who advised me to buy a new car within the year. He also has a Suburban which is a 2001, and it is leaking coolant. He took the engine apart on his - used ultra-violet lights - couldn't find the leak. He said that it is likely an internal leak, and that it often goes into the oil reservoir, which then creates sludge and will eventually ruin the engine. I agree that if this is a common problem with these cars, there should be a recall and a manufacturer's fix.
#20 of 29 Re: Suburban 5.3L coolant leak into engine [daves67]
Feb 15, 2012 (11:07 am)
Chevy's are plagued with this problem-- usually the intake gasket leaking at right rear of engine where the water jacket is- is a poor gasket design. A gallon a week would either go out the exhaust or leak to the ground. But I am confused-- it gets into the valve train but not the oil pan? The muddy mix may be whats fooling you--- can be from condensate (antifreeze leaking into engine) but your oil should be milky as well. I had the same problem on a 96 Suburban and the gasket repair was the solution if that helps.
#21 of 29 Re: Tahoe 5.3L coolant leak [maryt13]
Mar 01, 2012 (3:22 pm)
That's exactly what's happening to my truck, word by word as you described. Took it to a mechanic and he said it's the water pump, however I doubt it. I think it may be a leaky gasket or something. If you find out what's actually causing it please let me know. One of these days when I have enough time I'll try to take the front apart and maybe find out where it's coming from. Good luck!!
#22 of 29 Re: Tahoe 5.3L coolant leak [rbdog]
Sep 01, 2012 (5:58 am)
I have a 2005 LT suburban that had me baffled for about its coolant leak. It was dripping around the transmission (the pink color had me thinking it was transmission fluid first), leaving a decent size puddle. I feared it was the intake gasket but the oil was clean and all parts of the front and side of the engine were clean and dry... just about to give up and ready to pay big money on a repair when i finally found the leak! There are 2 long hoses that connect to the heater core on the passenger side of the truck. There is a white plastic "T" connect to the fire wall and the o-ring seal on it was bad. The white plastic piece was fine, just the internal seal had failed and its right below it is the A/C drip pan. This was the reason the coolant was traveling all the way back to the transmission housing. You can't just buy the o-ring seal, i had to buy the entire "T" but it was only $35 and the job was not too diffucult. I was really glad not to have gone into the heads or water pump route to resolve this. Hope this helps others with the similar odd coolant leaks with out a clear source issue.
#23 of 29 Re: Tahoe 5.3L coolant leak [tomahawk2]
Sep 28, 2012 (7:37 am)
Thanks for the encouraging suggestion, my 2003 Z71 has had a slight coolant leak for a few years, a little puddle on the floor after it has been parked for a while, or a trail of drops leading out the driveway. Within the week it has been losing a lot more coolant, so I took off the covers above and below the radiator and inspecting everything, can't find any sign of leak. Oil looks clean. Loosened the skid plate (removed front 2 bolts, loosened rear ones) but there doesn't appear to be any fluid accumulation there. Do you have a part number for the T connect?