Question about 1999 Pontiac Grand Am GT
The 3400 is notorious of the head gaskets blowing. this may not be in your case. Check the level of the coolant. Their may be air in the heater core. bring it up to operating temp then check the level.
Hope it is just air in the system not the heads!
Posted on Jan 27, 2009
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Posted on Jan 02, 2017
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