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find where the area of moisture build up is when the car is started then go from there, check the connections around the heater core also find where the area of moisture build up is when the car is started then go from there, check the connections around the heater core also ***The water pump is driven by the drive belt. The water pump has a "weep" hole that will start leaking when the water pump has reached the end of its useable life. Find the water pump (Has a large radiator hose going up into it, and a large black pulley in front of it) and look for coolant leaking out from underneath that pulley. Don't use any sort of "Leak-Fix" product, once a water pump seal has gone bad, it is not going to get better. Also, leak-fix products can do serious damage to your cooling system and heater core.

2009-09-07 00:07:32
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Q: How do you determine the location of a coolant leak on a 1999 Pontiac Grand Am GT Near drive belt hoses are fine?
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