Thread: Wet floor
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Old 11-13-2012, 06:26 PM   #6
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Join Date: Nov 2005
Location: SF Bay area
Posts: 992
My Ride: Sierra 1500 SLT
Check if it is coolant by pressing a paper towel onto it and seeing if it is colored, or rub it and smell your finger. If it is coolant, it is the heater core or heater core valve.

If it is just water, it is most likely the sunroof cassette drain tubes. If you don't have a sunroof, then could be the windshield seal or that the air conditioning cowl drain is clogged.
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