Water in My Defroster/Heater?
#1
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Water in My Defroster/Heater?
Ever since it got cold here in Wisconsin I've noticed that my defroster has become a refogger. It seems like there's water in the heating system that causes the windows to fog up every time I turn on the heat. I don't think it's the heater core. I've experienced that before and I remember the strong smell of anti-freeze and the slimy vapor it deposited on the windshield. I think this is rainwater. I'm hoping there's a drain in the firewall/bulkhead that's just plugged up with leaves and not a structural issue (read rust). Any ideas on checking it and cleaning it? -- Matt
Last edited by wrenchtech; 11-29-2009 at 08:58 PM.
#2
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It's partially caused by hot air can contain more moisture. When the warm air hits the cold windshield, the moisture condenses, much like steam condenses on the bathroom window during a shower.
Try lowering the windows 1/4" or so, so that moist air from inside (including from your own exhalation) can vent out of the truck.
Try switching from fresh air to recirculating on the controls (or vice-versa).
Try running the a/c if you have that- the cold a/c evaporator will condense moisture out of the air before it goes up to the window, but you may have to fight for a comfortable temp in the cab.
I've found that on my 91, the combination of rolling a window down slightly, putting the vent on recirculating and fan on high (it doesn't have a/c) keeps the fog to a minimum.
Try lowering the windows 1/4" or so, so that moist air from inside (including from your own exhalation) can vent out of the truck.
Try switching from fresh air to recirculating on the controls (or vice-versa).
Try running the a/c if you have that- the cold a/c evaporator will condense moisture out of the air before it goes up to the window, but you may have to fight for a comfortable temp in the cab.
I've found that on my 91, the combination of rolling a window down slightly, putting the vent on recirculating and fan on high (it doesn't have a/c) keeps the fog to a minimum.
#4
Registered User
I would still place my bet on heater core.... i just replaced one wednesday. When it started a few weeks ago there was NO hint of antifreze for the first week. It was just foggy.
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