Originally Posted by jagnni
This really my first real post and am not sure if this is the right place to post it, but hopefully someone can help me out:
Lately there has been a mist like substance on the inside of all the windows. I pulled the heater core and fixed the seals on it and that worked for about two weeks and than it came back. I pulled the heater core out again and the seals are still in good shape. but I have no idea what is causing this mist. It getting annoying to clean the windows every other day and it is very dangerous to drive at night. I have no idea what this fog like substance is, and unsure what is causing it. Any body have any ideas?
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I hade the same problem with my GT, the car after a bit of running would fog up the windshield and then would go away. After a few times, the windshield gets oily and you can barely see out unless you clean it.
The problem got cured by replacing the thermostat with a 160 degree unit. The car was running a bit hot and the heat was entering the cabin through the passenger side vent. If you take the center grill off and expose the wipper internal arms, you can stick your hand in there and actually touch the top of the heater assembly. On the inside of the car you will see that the top of the heater assembly is open to this area and any external heat can come in through there and up the dash to the windshield.
If you read my post on Stealth, you will find the modification to the area explained in detail.