coolant loss, Chevy Tahoe
#1
03-14-07, 12:56 PM
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.
#3
03-15-07, 08:20 AM
Intake manifold gasket
Originally Posted by crash928
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.
#4
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.
Don't forget to check the floorboard while your under pressure.
#5
03-15-07, 06:34 PM
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.
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
03-16-07, 02:37 PM
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.
