What's broken if your electric fan doesn't turn on with the A/C?
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Joined: Jun 2006
Posts: 171
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From: Los Angeles, CA
Car: 1985 Trans Am
Engine: 305 TPI
Transmission: THM 700-R4
Axle/Gears: Stock
What's broken if your electric fan doesn't turn on with the A/C?
So i found out that my single electric fan is supposed to come on when the A/C is turned on in my 85 trans am with 305 TPI. I don't know where to begin to solve this problem. any help would be "COOL."
Joined: May 2004
Posts: 5,338
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From: Lexington, SC
Car: 1987 SC/1985 TA
Engine: 350/vortec/fitech
Transmission: T56
Axle/Gears: 3.27 9-bolt
Check the wiring diagrams for '85 within the tech articles. You'll find that the fan relay kicks on the fan when it's grounded. For the A/C it is either grounded through a pressure switch or the AC control head.
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From: Montgomery, AL...for now
Car: 1987 F150...PAAARTY FOUL!
Engine: 300 I6 stump pullin sumbiscuit
Transmission: 4 speed grind box
Axle/Gears: 3.55 unlimited slip differential
IIRC its the pressure switch...
Josh
Josh
Joined: May 2004
Posts: 5,338
Likes: 73
From: Lexington, SC
Car: 1987 SC/1985 TA
Engine: 350/vortec/fitech
Transmission: T56
Axle/Gears: 3.27 9-bolt
I thought so too, but I checked the wiring diagrams for an 85 and VIN F shows a ground through the AC control head. Doesn't mean it's necessarily so though...
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Joined: May 2003
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From: Fort Lauderdale, FL
Car: Depends on what day it is..
Engine: Um, Chevy small-block
Transmission: One that shifts
Axle/Gears: Got those too...
It is definately through the A/C control head. But you really should make sure the relay is still good before tearing into the wiring or the dash.
Joined: May 2004
Posts: 5,338
Likes: 73
From: Lexington, SC
Car: 1987 SC/1985 TA
Engine: 350/vortec/fitech
Transmission: T56
Axle/Gears: 3.27 9-bolt
You can check the relay by jumpering the ground lead to a chassis ground. If the fan still comes on by the temp switch though that would rule out the relay as well.
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