Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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If you pressure test the system will it hold pressure and if not are you seeing any external leaks?
You will need a cooling system pressure tester. If you do not have one you can usually rent one at most auto part stores . See what you need in the link below.http://professional.justanswer.com/chat/index/dc414a27c3724daa984327c9704e8641