2000 deville base. Have noticed a "cold wet" spot on the floor in the middle of the carpet on the drivers side just in front of the seat. First time thought it was from a bottle of water that fell over. Went on a 300 mile trip this past week and noticed it again. It is cold to the touch. Before I get it up on ramps, is there any drain lines for condensate for the rear a/c that might be plugged? Or maybe a rubber floor plug under the carpet for some reason? Sounds stupid but I have dealt with heater core problems in the past and this is not in the same location or temp range. Thanks for any help or suggestions.