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Defrost Button Activates Cooling Fans?

To follow up my earlier blower-motor related post (where this motor did not work, so I cleaned its relay contacts, heard the motor work momentarily, then its fuse blew out) I have noticed that when I push what I call the window defrost button (just under the cabin air recirc button) the cooling fans come on (the cooling fans also come on with the A/C switch, which is normal).

If my memory serves me somewhat, I remember that the defrost switch would activate the blower motor and also send lots of heat to the windshield - sort of a "super heat-defrost" mode. My car is an 85.5.

Basically, I'm wanting to trace the blower-motor gremlins so I can get some forced heat into the car as the weather gets colder - and the window defrost is very important in Vermont.

...but is the defrost button supposed to activate the cooling fans? Maybe the P.O. messed with the wiring? Comments? Thanks!

Old 08-23-2011, 02:36 AM
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Dog-faced pony soldier
 
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Join Date: Feb 2004
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It's normal since defrost runs the a/c compressor.

Don't sweat it. The car will warm up just fine. I always warm mine up until I've got plenty of heat anyway - who wants to get into/drive a cold car? Get a remote starter if you must (but put it in neutral! The starter is torquey enough to move the car if in gear)

Last edited by Porsche-O-Phile; 08-23-2011 at 02:48 AM..
Old 08-23-2011, 02:46 AM
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Ornery Bastard
 
Join Date: Sep 2001
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Quote:
Originally Posted by Porsche-O-Phile View Post
It's normal since defrost runs the a/c compressor.
Spot-on. The reason for this is that running the A/C removes humidity from the air inside the cabin as well, which plays a big roll in defogging the windshield.

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Old 08-24-2011, 02:14 PM
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