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09-29-2010, 05:26 PM
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#1 | |
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AF Newbie
Join Date: Sep 2010
Location: Strathroy
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Humidity while running the heater
2002 Montana. Regardless of the temperature or season, when I run the heat, the cabin is instantly humid and the windows are fogged up within a minute. The floors are dry. The heater core is DRY.
Here's the strange part; with the temperature set high I can stop the humidity by hitting the AC switch on. It will then blow warm DRY air. |
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09-29-2010, 06:38 PM
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#2 | |
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Re: Humidity while running the heater
there has to be water getting into the car somewhere somehow, turning on the a/c does dry out the air in the interior thats why most cars automatically switch on the a/c compressor in defrost mode to help with defogging the windows
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10-01-2010, 10:08 AM
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#3 | |
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Re: Humidity while running the heater
o.k., let's say I have a very slow leak in the heater core (slow as in maybe it's just releasing some steam). Would it make sense then that the a/c control turned on would remove that 'steam'.
The thing I don't like about that theory is that when the heater is on and the air is humid, I don't smell antifreeze and there is no greasy film on the windows. |
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10-01-2010, 05:54 PM
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#4 | ||
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Re: Humidity while running the heater
Quote:
Is your antifreeze level decreasing slowly? This still sounds like a heater core. |
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10-04-2010, 07:39 PM
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#5 | |
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Re: Humidity while running the heater
yeah, a slooooww leak is present. But I can't smell anti-freeze in the 'humid' air. My mechanic's been at the heater core twice and it's been DRY. That's why I'm thinking that maybe it's just a steaming leak once it's hot and under pressure.
The A/C switch still confuses me though. The A/C can't really be running when I have the temp set to HOT and it's cold out....can it? |
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