What is wrong with our coolant system?

1991 PONTIAC TRANS AM
135,000 MILES
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KHEVA
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Our 1991 trans am is losing about 2 inches of coolant a day. The mechanic saw nothing wrong with our water pump. We don't think it's a blown head gasket because we don't see anything wrong with the oil and the exhaust is clear. What could it be?
Jun 4, 2012 at 3:11 PM
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SATURNTECH9
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To verify if its a head gasket you would use a chemical tester you can rent at auto zone.With the amout of coolant your using you should be able to get a coolant pressure testerand pump the cooling system and find the leak that way.
Jun 4, 2012 at 3:23 PM