Help please odd AC problem won't work on one fan setting only.
Thread Starter
Member
Joined: Mar 2009
Posts: 159
Likes: 0
From: Saint Louis, MO
Car: 1988 Firebird Formula 350
Engine: L98 383 cubes Multipoint FI
Transmission: 700R4
Axle/Gears: Ford 9 inch with 3.70 gears
Help please odd AC problem won't work on one fan setting only.
My AC works perfectly normal until I put the fan selector on hi then AC and fan just shut off. I replaced the dash control unit and that had no effect. So I changed the fan salvage yard piece and I still have the same issue. Can some one point me in the right direction on what to check next?
Member
Joined: Nov 2006
Posts: 273
Likes: 2
From: Mesa, Az
Car: 92 1LE B4C
Engine: 350
Transmission: 4L60
Axle/Gears: 4th gen 3.42
Re: Help please odd AC problem won't work on one fan setting only.
Im guessing you have a short to ground. I wouldn't keep replacing parts. See if you can get a hold of a wiring diagram and start looking for shorts. It will most likely be a real pain but I think that is where you will find the answer.
Supreme Member
Joined: Jul 2009
Posts: 2,328
Likes: 10
From: Kitchener, ON
Car: 1988 GTA
Engine: LB9
Transmission: T5
Axle/Gears: 3.45
Re: Help please odd AC problem won't work on one fan setting only.
Most likely a bad high speed fan relay, located on evap housing underhood.
Thread Starter
Member
Joined: Mar 2009
Posts: 159
Likes: 0
From: Saint Louis, MO
Car: 1988 Firebird Formula 350
Engine: L98 383 cubes Multipoint FI
Transmission: 700R4
Axle/Gears: Ford 9 inch with 3.70 gears
Re: Help please odd AC problem won't work on one fan setting only.
Eseibel67 BINGO! You where right except for the location of said relay. It was close to that location though.
Supreme Member
Joined: Jun 2011
Posts: 2,036
Likes: 6
From: knoxville tn
Car: 86 IROC
Engine: 5.0 TPI
Transmission: 700-R-4
Axle/Gears: 2.73 open
Re: Help please odd AC problem won't work on one fan setting only.
My AC works perfectly normal until I put the fan selector on hi then AC and fan just shut off. I replaced the dash control unit and that had no effect. So I changed the fan salvage yard piece and I still have the same issue. Can some one point me in the right direction on what to check next?
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