I have water leaking from the passenger sidecondensation overflow, onto the passenger floarboard, I am sure it is due to a blocked overflow tube on the outside. Does anyone know where that is located on a 2000 grand prix
by 
kochk
ANSWERS: 4
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if its warm water or hot it may be your heater core leaking.
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I had this happen to my 2002 Grand Prix, and it was a hole in the firewall
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http://www.answerbag.com/q_view/419414 check this out if it is a rain/snow related problem...
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I had this problem on my 97 grand prix and solved the problem by using a coat hanger straightened out, then pushed down through the passenger side vent screen below the windshield right in the corner near the door. After some proding with the wire finaly it broke through the crud that was blocking the drain hose. No problem after that.
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