Question about 1999 Dodge Durango

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Defrost and Heater causes windows to fog

Everytime I turn on the defrost or the heater it fogs up the windows to where I can't see out of them so I have to keep it on cold and can't use the heater or defrost. What could it be and what do I do?

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  • Dodge Master
  • 6,674 Answers

If it smells like antifreeze, and leaves a film on windshield, it's probably a leaking heater core, but if not, your drain tube/passage for heater/AC duct-work, is plugged and not allowing moisture to drain out. Not 100% sure where drains are on that but, I would look real close at lower firewall in engine compartment,opposite duct-work, as well as under truck near front floor, for tubes sticking out, and carefully and gently, run a pipe cleaner or similar in & out to clean, until moisture starts to run out.

Posted on Nov 14, 2009

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This may be due to a bad heater core or dirty core with a plugged water drain, first see if the a/c works. turn it on and see if the air gets cold and if the ac compressor works.

The way the defrost works to keep windows from fogging up is that when the front defroster is tuned on the ac should also be on, on most cars when you go to defrost it will turn ac on automatic. the system then uses hot and cold air to remove the moisture in the air to avoid window fogging. if your a/c is not working then that may cause window to fog, but if you are also getting a smell then the drain that lets out condensation may be plugged and then water builds up and also mold from always being wet and when heat is on you smell that.


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