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Its most likely your heater core Heater core is on the passenger side so if it is broken, it will be wet over there. However, what it will be leaking is antifreeze which will smell, and make the windows fog up with an oily residue. If the leak is simply water you either have a bad windshield seal or possibly sunroof (if present). A leaking sunroof can cause water to run along the top of the header panel, down the windshield support and drip out under the dash. Additional Note: I just experienced this same issue - Pool of water after heavy rain on the passenger floor. Found the Gasket for your Cabin air filter was not on correctly. Allowing water that is suppose to run off from the front windshield down the drain plug to drip down into the car - through the air filter. Remove the cover to the Cabin air filter. Under the passenger side windshield wiper. Plastic screw holds it on. There is a gasket along the top edge. Make sure its on completely and sealed.

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โˆ™ 2008-09-23 17:16:35
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Q: What could be the reason your 2002 Monte Carlo SS is leaking under the dash of the passenger side?
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