coolant loss, Chevy Tahoe

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  #1  
Old 03-14-07, 12:56 PM
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coolant loss, Chevy Tahoe

I have 1999 Chevy Tahoe 5.7L, automatic with 125K miles. Recently I replaced the water pump because coolant seemed to be leaking from the weep hole in the pump. Changed all the hoses at the same time. The engine is still losing coolant and you can smell coolant when it is warm. Cannot find any visible leaks anywhere but it is losing about a quart of coolant every 100 miles.
 
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Old 03-14-07, 01:55 PM
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I would check your heater core or its more than likely your intake manifold gaskets.Look on top of the mtr at the front and back of the manifold left and right.
 
  #3  
Old 03-15-07, 08:20 AM
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Intake manifold gasket

Originally Posted by crash928 View Post
I have 1999 Chevy Tahoe 5.7L, automatic with 125K miles. Recently I replaced the water pump because coolant seemed to be leaking from the weep hole in the pump. Changed all the hoses at the same time. The engine is still losing coolant and you can smell coolant when it is warm. Cannot find any visible leaks anywhere but it is losing about a quart of coolant every 100 miles.
Sounds like the intake manifold gasket finally went. Late 90's, early 2000 GM engines had an intake manifold gasket problem. The "rubbber" layer will erode causing both internal and external leaks. Aa a matter of fact, just helped a friend with his '99 Suburban last Saturday. A pressure chech will varify the leaking area.
 
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Old 03-15-07, 09:45 AM
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You can borrow a coolant system pressurizer from Autozone and pump it up to about 15 lbs. If the radiator is full when you do it you will more than likely have no problem finding the leak. If you don't find it externally right away, let it sit for 10-15 minutes under pressure then start the vehicle up. If it smokes white then it's internal.

Don't forget to check the floorboard while your under pressure.
 
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Old 03-15-07, 06:34 PM
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Perfect if you can get hold of a pressure tester.
As mentioned pump the system to 15psi walk away and check under the vehicle due to if it is the intake gaskets it has a way of running down the back of the motor and onto the bell housing running down.
 
  #6  
Old 03-16-07, 02:37 PM
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Unfortunately, the intake manifold does seem to be the culprit, although I still haven't pinpointed the exact place; it seems to be internal. Looks like a bear to R&R. Thanks for the help.
 
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