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
#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.
#22 of 28 Re: Coolant leak [jiver]
Jul 13, 2010 (9:28 am)
I'm having the same problem. I bought the car from a friend and he gave me a deal because he took it in and they said it was the water pump so he took a thousand dollars off the price and sold it to me because i had a place by my house that does it for much cheaper then a grand. Well I took it in they did a pressure test couldnt find the leak. They filled up with coolant and 500 miles later its all gone again. Im hoping it's the gasket inside the water pump like some mentioned before because I dont mind paying 400 bucks to replace it I just fear its a cracked head. If it was a bad gasket in the water pump wouldnt they be able to find the leak with a pressure test?
#23 of 28 Re: Coolant leak [timmonsk]
Jul 13, 2010 (9:36 am)
If you are loosing that much coolant and don't see a leak, then I would suspect a head gasket. Coolant could be leaking into the cylinder, and then passing out the exhaust pipe.
Doing a pressure test with the spark plugs out (thereby allowing the coolant to pass into the cylinder if a bad head gasket), may have helped find the problem.
#24 of 28 Re: Coolant leak [kiawah]
Jul 13, 2010 (10:34 am)
That's what i was scared of. You got a ballpark idea of how much that's going to cost me. My friend kind of screwed me here so i might just fill her up with coolant and pass her on down to the next victim cause I dont have much money to fix her.
#25 of 28 Re: Coolant leak [timmonsk]
Jul 13, 2010 (11:18 am)
Labor rates would vary significantly across the country, so wouldn't hazard a guess. However calling to a couple local shops would get you some estimate ranges fairly easily.
But you shouldn't automatically jump in and have this done without some further diagnostics to confirm that is the problem. Trying to remotely diagnose problems, using third party reported symptoms and sounds, is risky at best. Nothing beats hands on by skilled/competent mechanics.
Jul 16, 2010 (12:37 pm)
If its a head gasket wouldn't the coolant be mixing with the oil which i know is bad? I mean i dont mind filling it up with coolant every once in a while. If the coolant is just getting shot out the exhaust then thats not so bad right? Im thinking about getting a extended warranty just in case this turn out to be a huge problem. Im thinking to check to see if the head gasket is bad is probably going to cost me over a grand and that might not even be the problem. I live in the Southeast so anyone have a ballpark figure on how much it would cost me in labor to them just check to see if it's a bad head gasket?
#27 of 28 Re: Head Gasket [timmonsk]
Jul 16, 2010 (3:40 pm)
A damaged head gasket, can let coolant into the cylinder. The gasket forms a seal between the coolant chamber around the cylinder, and the piston chamber itself. It also forms a seal between the coolant chamber and the outside of the engine, but you'd see it leaking if that was your problem. From the piston chamber, it can:
- rust the cylinder walls, so they're not smooth anymore, causing burning oil, poor compression, poor gas mileage, rust on the valves, etc
- seep past the piston rings, and into the oil, causing similar corrosion damage in the engine, bearings to fail, major engine failure, etc
- get blown out the exhaust, ruining that expensive catalytic converter.
If the coolant was just leaking outside, like from the radiator or water pump bearing, then technically the water does no damage......just be sure to keep coolant to keep the engine from overheating and damaging engine. If the coolant is leaking inside the engine, then major problems, get it fixed pronto.
If they pressure test the cooling system with the spark plugs out as I indicated before, then you may detect more easily the drop in coolant pressure as it's leaking into the piston area. This allows the air and coolant someplace to exit, as opposed to being restricted by a closed piston chamber. A gasket problem may not necessarily show up this way, but if it does show.... you know for sure that the gasket is bad.
Head gaskets, fuel pumps, cluster gauge problems, and transmission problems.....all some common problems, unfortunately.
#28 of 28 Re: Head Gasket [kiawah]
Jul 19, 2010 (5:40 pm)
Thanks for all your help I'm trying to create a list of stuff to tell my mechanic to check for. Definitely going to do the spark plug with the pressure check to see if its getting into the spark plugs. My car gets about 11mpg which is pretty much all city driving and I also have 35 inch tires on the car which probally makes it closer to 12. I drive very cautiously and never reach over 2,000 rpm and i thought 12 mpg was pretty low so now im worried about the inside cylinders being rusted or would the gas mileage be much poorer like around 6mpg. When im idling the oil pressure drops down to around 30 and when im riding goes up to around 45 does this sound normal to y'all. I appreciate all your help. I think I'm just going to park it for a while until I figure out what to do. Kiawah If you can think of anything else I can tell the mechanic to check for so hes not wasting time looking around it would be greatly appreciated. I read somewhere you can by coolant that lights up with a blacklight. I thought that might help me find the leak better if it was seeping out anywhere? Thanks for all your help.