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What can cause water to leak in on the passenger side floor board and rear passenger side floor board of a 2001 Pontiac Grand Prix only does this when the air conditioner has been on?


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2009-01-26 23:39:42
2009-01-26 23:39:42

air conditioning can cause moisture in the air to condense, especially around vents where the air is moving at high speed. If you live in a very humid area, this could be caused by the air conditioning being so cold that the moisture is condensing out as soon as the cold air meets the warm, damp air. Try running the air conditioner at a higher temperature setting, or on 'normal' instead of 'max'. The more likely senario is that water is leaking in from an area below the windshield under the hood. There is box (under the plastic cover at the bottom of the windshield on the passenger side) that allows air from outside to be pumped inside. If you have this area open you will a see foam seal painted the same color as the vehicle at the base of the box. This so called seal dry rots and GM knows this; however, the seal cannot simply be replaced from what I was told by a windshield replacement shop and a dealer. It is riveted together and must be cut apart and then reassembled. This issue caused the blower motor to seize after the leak corroding the internals of the motor itself.

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It's on the right side of the dash board. Open the Passenger door and look on the side.

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Its on the floor board on the passenger side of the car. Just remove the plastic piece and there it is.

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Water is leaking on passenger side floor board when heat is on

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If you are sure it is water and not coolant, then the A/C Condenser drain line is stopped up. You will find it near the firewall on the passenger side. Look for a tube under the Jeep. If it is coolant, which will taste sweet, your heater core is leaking and must be replaced.

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this could be from the heater core. When the heater core goes out it leaks....right into the passenger side floor board If it is water, not coolant, the problem could be a plugged air conditioner drain. Easily accesible from under the hood.


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