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Old 09-06-2001, 04:24 PM
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Join Date: Jul 2001
Location: Kingston, Ont.
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"winterizing" tips for the a/c

Notwithstanding the weather in Texas or Florida, the approaching Fall means less and less a/c use. Anyone know of some good off-season preparations and procedures for a/c (on the 300e in particular); should one run the a/c once a month, even in sub zero weather, just to keep everything 'normal' etc? or alternatively, should one literally disconnect the ac in order to not even activate it accidentally during the off-season?
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Old 09-06-2001, 04:44 PM
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Join Date: Aug 2001
Location: At Sea
Posts: 1,729
most modern cars use the a/c to dehumidify air in the winter, otherwise your windshield & windows would fog up if you just blew warm wet air at it.
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Old 09-06-2001, 06:14 PM
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Join Date: May 2000
Location: Soperton, Ga. USA
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Run it at least once/week and this should be accomplished whenever you operate in defroast mode.
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Old 09-07-2001, 12:09 AM
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Join Date: Jun 1999
Location: Surrey, Beautiful British Columbia, Canada
Posts: 750
i have always wondered about the use of a/c to clear up
windows during the winter months.

what was changed? my old cars do not require a/c operation.
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Old 09-07-2001, 01:49 AM
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Location: Santa Monica, CA
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The airco air is dehumidified by the temp. drop. That's why many high end compressed air systems use a refrigerant dehumidifier as well as a dessicant (medical/dental systems come to mind). This dehumidified air defrosts by "drying" the glass because of it's lower relative humidity. Hot air works by raising the "dew point" of the glass above the temp. that moisture will condense, relative to it's % humidity. It makes sense if you say it really fast.
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

Last edited by jbaj007; 09-07-2001 at 02:23 AM.
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Old 09-07-2001, 10:47 AM
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gee, thanks! golden rule
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Old 09-08-2001, 07:24 AM
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Join Date: May 1999
Location: Lehigh Valley PA
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The old GM systems used to recommend running the AC once a week to keep the seals sealed, or something like that. I still try to do it at least once a week, just because it's cheap PM.
Bob Roe
Lehigh Valley PA USA
73 Olds 88, 72 MB 280SE, 78 Datsun 280Z, 71 T-Bird, 72 Olds 88, 83 Nissan Sentra, 85 Sentra, 73 230.6, 91 Integra, 83 300SD, 91 Volvo 940GLE wagon, 84 300SD, 95 Subaru Legacy L wagon, 02 Mountaineer, 91 300TE, 08 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon all gone... currently
2007 Honda Odyssey Touring, 2011 Honda Odyssey Touring
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