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Smoke from vents, and windows fog up. 850

posted by  someone claiming to be 850 T-Gul on  Mon Jun 16 19:00 CST 2003 [RELATED]

Hello, for the past few months I have noticed that smoke/dust occasionally exits the front vents and the windows and windshield fog up a bit. I believe it may be related to the fact that the passenger side "de-fogger" doesn't seem to work while it clears up the driver's side fine thank god. Does anyone have any experience with this? Thank you.








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    Smoke from vents, and windows fog up. 850

    posted by  davidm on  Tue Jun 17 04:20 CST 2003
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    Though one is tempted to suspect the infamous evaporator (big job) or heater core (much easier), the fact that the problem occurs on only one side makes me suggest a look at the ductwork under the dash. Passenger side is probably pretty easy to get at - drop the glovebox out of the dash and see if there's a blockage or if it's somehow come apart.

    Does it happen when the heater is off? (would indicate possible heater core problem.) When the a/c or defroster is on? (indicative of an evaporator problem). Try all combinations.
    --


    David
    1998 S70 T5SE // misc mods (mostly lighting) // red calipers
    1992 940 GLE // Hella Micro DE foglights and 170K








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    Smoke from vents, and windows fog up. 850

    posted by  someone claiming to be Dave on  Tue Jun 17 00:43 CST 2003 [RELATED]

    Does it smell like burning coolant? Do you need to re-fill your coolant on a regular basis? If so, it may be your heater core.








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      Smoke from vents, and windows fog up. 850

      posted by  someone claiming to be 850 T-Gul on  Tue Jun 17 07:38 CST 2003 [RELATED]

      It doesn't seem to have too much of a smell to it. I did have to refll my coolant a little while ago,and the volvo dealership did it for me free of charge. The guy topped off the coolant pretty lazily and spilled some around the coolant tank, I wanted to smack the guy for being so careless. But the smoke started before that, the same exact time I noticed the passenger side window not clearing up when the de-humidifier is put on. Now that I come to think of it the first time I noticed the smoke, the onlt thing I could see under the hood was coolant stains around the tank, which is on the passenger side. Could the coolant have spilled on something and been burned and the smoke enter the vents?








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        Smoke from vents, and windows fog up. 850

        posted by  someone claiming to be Dave on  Mon Jun 23 07:18 CST 2003 [RELATED]

        Don't know, as I am not a DYI. But when my heater core went, I was topping off the coolant every other day. And the smoke reeked. It wasn;t a tough diagnosis.








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    Smoke from vents, and windows fog up. 850

    posted by  someone claiming to be Nate on  Mon Jun 16 22:56 CST 2003 [RELATED]

    Possibly your ac evaporator leaking- the smoke is perhaps R134a leaking out.






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