With the heat/ac off, there is a light mist that comes from the vents. The windsheild also fogs up w/ defrost on .
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1999 Dodge Durango Question: A/C not working
Answer #1patrick mannion from Greg Solow's Engine Room, August 03, 2009, 23:03Master
I wonder if the heater core is leaking? Do you smell hot antifreeze or have you experienced coolant loss? To find out if the heater core behind the dash is leaking the cooling system will need to be pressurized with a pressure testing tool. A leaking heater core will cause the windscreen to fog up.
Answer #2Florida August 29, 2009, 19:09Rookie
Sounds to me like it is time for a heater core...