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Damp pasanger floor mat 2020 GMC AT4

Dougie9
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Dougie9 New Member

Dougie9

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So I have seen tons of posts about this but the solution is stumping me. I’ve tested for leaks on windshield, back brake light, rear window you name it! Never seen water get to passenger side with all the plastic footing pulled and carpet pulled up. No rain today, and drove about 15 miles away, let truck idle with AC on. Inspected AC drain line dripping condensation onto the parking lot steadily. Drove home and pulled floor mat and low and behold, under the mat there was moisture. The floor was extremely hot. Maybe that’s what’s causing it? I’m stumped. Been at this for a week.. anyone have any ideas….

Dougie9 New Member

Dougie9

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Sorry for the late reply! Not radiator fluid. And I’ve drove around all week with the carpet pulled up to see if I can see where the water is coming from. All week with AC blasting etc… and no water in floorboard. I’m seriously thinking it’s from the heat under the floorboard and the weather tech mat building up condensation on the carpet. Idk what else it could be…. 

64BAwagon Senior Enthusiast

64BAwagon

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I would look for witness marks by starting as high as you can up near the windshield and then working down. Its not uncommon to have a poorly sealed windshield. My second look would be into the weatherstrip at the hinge area vertically on the lower "A" pillar. I have seen a number of GM trucks with leaks along that A pillar seal where the weatherstrip looked good but once it was pulled it had witness marks under the channel on the pinch weld. 

Joe98 Enthusiast

Joe98

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By any chance a bottle of water stuck under the seat ? Heater core was my first guess.  If a passenger you had previously spilled something should have dried up by now ?  If it persists wouldn't hurt to take it to dealership.  Good luck.

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