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Old Aug 25, 2009 | 07:14 PM
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blueme's Avatar
blueme
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From: mokena il
Default heater/ac fan problem

when i switch the fan to high setting the rear window defroster comes on and the fan stops. all other fan setting work. as i have put in a ls1 the air conditioning compressor isnt installed yet. anyone have any ideas?
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Old Aug 25, 2009 | 07:52 PM
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my 76 ray
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A previous owner was named Bubba.
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Old Aug 25, 2009 | 11:19 PM
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...Roger...
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Originally Posted by blueme
when i switch the fan to high setting the rear window defroster comes on and the fan stops. all other fan setting work. as i have put in a ls1 the air conditioning compressor isnt installed yet. anyone have any ideas?
Thats the way its supposed to work. Early 78s were wired that way. Whats a little weird is the high blow relay gets its ground through the defrost grid in the rear window.
If you want to change it just find a new ground for the black wire on the high blow relay.
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