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05-30-2011, 08:07 PM
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#1 |
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Senior Member
 
Join Date: Jan 2002
Location: Williston, ND
Posts: 2,999
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a/c fan switch
Hi all, the fan switch on my 72 cheyenne super will not work on high, it works on the rest of the settings. This is an a/c truck/switch setup and a 402. I want to say I remember the reason this happens is because of the resistor or the switch itself of something along those lines. I was just wondering if someone could shed some expertise on the problem. thanks
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68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi |
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05-30-2011, 08:22 PM
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#2 |
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Registered User
Join Date: Jul 2010
Location: Valencia, CA
Posts: 364
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Re: a/c fan switch
It's your High Speed Relay - passenger side attached near vent pull on heater/ac box...I'll look for a pic.
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05-30-2011, 08:25 PM
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#3 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: a/c fan switch
could be the resistor, the switch, the relay, or a bum wire
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05-30-2011, 08:27 PM
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#4 | |
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Registered User
Join Date: Jul 2010
Location: Valencia, CA
Posts: 364
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Re: a/c fan switch
Quote:
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05-30-2011, 08:44 PM
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#5 |
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Moderator
 
Join Date: May 2007
Location: Southern Cal
Posts: 19,996
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Re: a/c fan switch
Try turning your switch on high, then wiggle the wire connection on the relay.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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05-30-2011, 11:13 PM
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#6 |
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Registered User
Join Date: Dec 2008
Location: Pleak, Texas
Posts: 420
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Re: a/c fan switch
The relay is powered by the fat orange wire coming from the fuse block. Depending on where it's plugged into, it could just be a blown fuse.
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-1967 Chevrolet Fleetside LWB- 350 V8 w/thumpr cam, NV3500, 3.08 gears, A/C, PS  -1983 Chevy Silverado C1500- 383 stroker, TH400 -1989 Chevy Silverado K1500 SWB- 5.3L swap, 700R4, 3.42 gears -And a '66 Ford Mustang- 200 I6, C4 trans, rust bucket "The only thing we have to fear is fear itself." -FDR (and maybe rust too)  You've gotta be able to stop and steer before you can go fast! |
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05-30-2011, 11:34 PM
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#7 |
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Registered User
Join Date: Aug 2002
Location: Muskogee, Oklahoma
Posts: 2,914
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Re: a/c fan switch
Had the same problem, I replaced the relay.
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05-31-2011, 07:48 AM
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#8 | |
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Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,144
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Re: a/c fan switch
Quote:
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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