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09-30-2008, 11:07 AM
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#1 |
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Registered User
Join Date: Jun 2004
Location: El Lago, TX
Posts: 1,668
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A/C fan only works on high...
I think i have read about this problem before, but I had no luck with a search of the forums. My fan only blows on high. It does nothing on low or medium. I replaced the fan itself about a year ago and it has been working fine until now. Anyone have any idea what the problem is?
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09-30-2008, 11:12 AM
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#2 |
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Registered User
Join Date: Feb 2007
Location: Austin, TX
Posts: 3,930
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Re: A/C fan only works on high...
Sounds like the switch. Mine works in every position but high.
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1977 GMC Sierra Grande |
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09-30-2008, 11:14 AM
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#3 |
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1962 C-10
Join Date: Apr 2005
Location: Las Vegas, New Mexico
Posts: 4,978
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Re: A/C fan only works on high...
I had this same problem on my '83. I asked my brother in law, who's a mechanic, and he said it's the switch that causes these problems. I never fixed it on my old truck, but he has done a few. Replace the fan switch...
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Joseph Chavez  "See the USA in a Chevrolet!!" ......................_____ .........________//__{\_____ ,,,,,,,/__(O)___//___/__(O)_/ 1962 C10 Shortbed Fleetside 327/th350 GV overdrive 1974 C10 Longbed Fleetside 350/th350 "The Trash Truck" 1999 Chevy 2500 OBS, Longbed 5.7/4L80E 4x4 2015 GMC Sierra SLE 1500 4x4 |
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09-30-2008, 11:17 AM
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#4 |
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Registered User
Join Date: Jan 2005
Location: Hixson TN.
Posts: 74
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Re: A/C fan only works on high...
Mine did that not to long ago. Check the resistor, it's mounted on the evaporator box. Mine was coroded cleaned it up works fine now.
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82 C-10 Scottsdale LB owned since 89 350 crate vortec heads Crane 1.6 full rollers edelbrock 1406 edelbrock performer eps intake dynomax headers/flowmaster 70's BTO 700r4 level 3 custom 2 piece driveshaft 12 bolt gov loc w/3.08 |
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09-30-2008, 12:29 PM
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#5 |
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I don't think these pills work
Join Date: Apr 2008
Location: burkburnett,Tx
Posts: 626
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Re: A/C fan only works on high...
x2 check the resistor it controls the lower speeds of the fan your high speed is wired directly to a power source so even if the resistor is bad the high will still work
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SQUARE84  90 SUBURBAN |
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09-30-2008, 02:48 PM
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#6 |
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Registered User
Join Date: Sep 2006
Location: New Haven, MO
Posts: 1,243
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Re: A/C fan only works on high...
I agree with Joe its the switch. My car did the same thing on the lower 2 speeds, one of the resistors (I think) inside it went bad.
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-Lincoln 1987 GMC S15 (soon to be a chevy clone)  2.5l, 4 speed, no ps, no pb, no ac Silence is golden, but duct tape is silver.  Spoken by Cletus the hillbilly I like stickers... a whole bunch. Last edited by abebummy26; 09-30-2008 at 02:49 PM. |
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09-30-2008, 02:51 PM
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#7 | |
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Registered User
Join Date: May 2008
Location: Eville IN.
Posts: 365
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Re: A/C fan only works on high...
Quote:
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09-30-2008, 07:39 PM
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#8 |
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Senior Member
Join Date: May 2004
Location: Caldwell,Tx.
Posts: 3,648
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Re: A/C fan only works on high...
What year truck ? My 73 Cheyenne only blows on high if the temp control lever is all the way over to cold . If you back it down a little , you feel a click and then the fan can be run in any speed . The owners manual says that this is how it is suppose to work .
Frank
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Born and proudly residing in a Red State ! |
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10-02-2008, 02:19 PM
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#9 | |
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Registered User
Join Date: Jun 2004
Location: El Lago, TX
Posts: 1,668
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Re: A/C fan only works on high...
Quote:
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