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2004 gmc envoy v8 loosing coolant. 70000. 15mpg. A small…

Customer Question
2004 gmc envoy v8...

2004 gmc envoy v8 loosing coolant

Mechanic's Assistant: How many miles on the car? How has your mileage been lately?

70000. 15mpg

Mechanic's Assistant: Are you fixing your Envoy yourself? What have you tried so far?

A small reputable repair shop mechanic said the water pump was probably going out but he could not find a leak

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

In 3 weeks it has lost 3-4 qts of coolant

Submitted: 10 months ago.Category: GM
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Answered in 1 minute by:
10/5/2017
GM Mechanic: Mike S., ASE Certified Technician replied 10 months ago
Mike S.
Mike S., ASE Certified Technician
Category: GM
Satisfied Customers: 8,152
Experience: ASE Certified with 25+ years experience.
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Hi, I am Mike, welcome. I'm reviewing your question.

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GM Mechanic: Mike S., ASE Certified Technician replied 10 months ago

Rent or borrow or purchase a cooling system pressure tester and pump the cooling system up to 15 psi and look for the leak. It will be a lot bigger under pressure. First check with the engine off, than engine idling and if while idling nd under pressure is white smoke pours out the exhaust, then you have coolant entering the combustion chamber either from a blown head gasket or somewhere else such as a leaking intake manifold.

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