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I have rear ht and air fan, I have been using water, could not find where. no water on the front floor. Have been using my air a lot idling while waiting to pick up grandkids. When I pulled up my car mats to clean, from the driver seat to the rear was very wet. Checked my water {low) Just didn't think of looking on the left side, as I checked to see if it was the heater core I looked on the right.
Thinking it might be the ac drain tube. How do I locate this? Seems it happens after I have run the air a lot. Hot here! It is all on the left from the back of the driver seat to the very rear Carpet is somewhat sticky.. probably leaking longer then I realized
If the condensate drain is plugged then the water will back up into the heating vents and eventually spill out onto the floor. The drain is under the van behind the front right tire.