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#1 |
SKINNY TIRES RULE!
Join Date: Sep 2001
Location: Bothell, WA
Posts: 11,049
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Blower fan - A/C
The high speed on my heater/AC doesn't work - the fan shuts off when I flip it to high. I have changed the high speed fan relay and the resistor. What else could the problem be – The Switch, the blower itself?
![]() Winter is here in the NW and it would be nice to have the high speed to defog the windows.
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bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L |
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#2 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: Blower fan - A/C
Trace the red or orange wire off relay back to your fuse panel. There are a couple of connections near the plug in that get loose and heat up causing a poor connection.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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#3 |
Lovin' Life in Miss.!
Join Date: Mar 2004
Location: Puckett, Mississippi
Posts: 1,937
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Re: Blower fan - A/C
hear the relay workin?
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#4 |
SKINNY TIRES RULE!
Join Date: Sep 2001
Location: Bothell, WA
Posts: 11,049
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Re: Blower fan - A/C
I'll double check the plugs into the fuse panel, but everything works but high speed.
Where is the heater relay? I just replaced the high-speed fan relay (located on the far left side of the A/C box, under the glove box.)
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bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L |
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#5 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Blower fan - A/C
That is the heater relay....same animal, different name.
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#6 |
SKINNY TIRES RULE!
Join Date: Sep 2001
Location: Bothell, WA
Posts: 11,049
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Re: Blower fan - A/C
So, what else could it be?
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bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L |
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#7 |
Registered User
Join Date: Oct 2001
Location: Grapevine, Tx.
Posts: 2,142
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Re: Blower fan - A/C
bouncytruck
It could be the ground wire to the relay that is located behind the glove box near the side panel. It is up pretty high on the inside firewall. If this is your issue the fan will work on high just at a very slow speed. It is a short black wire that goes from the relay to a ground. This is usually one if the bolts that hold the heater core case on, this wire will get broken due to it being such a short wire or misplaced when someone swaps out the heater core.
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John Hutchison Grapevine,Texas 68 1/2 t swb 68 Mustang 69 Jaguar 71 1/2 t swb 88 Supra CompTs6m 93 Escort GT 2005 Corolla XRS |
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#8 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: Blower fan - A/C
As Hutch says. Just take a jumper wire and hook to relay and then to a good ground and test your high speed. If it works you found yor problem.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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#9 |
Registered User
![]() Join Date: Jul 2004
Location: Lilburn, GA
Posts: 209
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Re: Blower fan - A/C
Mine did that and the switch was bad. Apparently it was not grounded very well and overheated causing it to burn the internal connectors. It worked on all speeds except high speed was intermittent. Swapped it out and checked all the grounds and it's been working fine.
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#10 |
Registered User
Join Date: Aug 2003
Location: Bonner Springs, KS
Posts: 307
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Re: Blower fan - A/C
Trace the wire that goes to your cigarette lighter. It also supplies power to the high-speed fan. I think mine went directly to the fuse block. No relays here. Mine was simply disconnected.
T
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1972 Cheyenne (awaiting 2nd Restoration) 1996 Tahoe (Wife's Car) 1968 Volkswagen Beetle (My Daily Driver) 2004 Silverado SS (Can't afford to drive the dang thing with gas at $ 3.00) |
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#11 |
SKINNY TIRES RULE!
Join Date: Sep 2001
Location: Bothell, WA
Posts: 11,049
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Re: Blower fan - A/C
Thanks for all the input. I'll give each these a try.
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bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L |
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#12 |
Registered User
Join Date: Feb 2002
Location: Vacaville, CA
Posts: 2,746
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Re: Blower fan - A/C
You obviously have power to the switch (the other speeds work). If its not the relay ground I would bet on the switch. GM under designed that switch. I have had to replace all of mine, they were toast.
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#13 |
Registered User
Join Date: Aug 2003
Location: Bonner Springs, KS
Posts: 307
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Re: Blower fan - A/C
Actually, the High-Speed Fan power is supplied separate from the two other speeds. It is the big orange (I think it was orange) wire that goes to the cigarette lighter that only powers the High-Speed portion. So, the fan can work on the two lower speeds with there being no power to the High-Speed, at all. I don't think mine even has any relays or fuses in the wiring, either. It goes directly to the fuse block.
TP
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1972 Cheyenne (awaiting 2nd Restoration) 1996 Tahoe (Wife's Car) 1968 Volkswagen Beetle (My Daily Driver) 2004 Silverado SS (Can't afford to drive the dang thing with gas at $ 3.00) |
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#14 |
SKINNY TIRES RULE!
Join Date: Sep 2001
Location: Bothell, WA
Posts: 11,049
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Re: Blower fan - A/C
Hum, My cigarette lighter doesn't work either. I wonder if this could be the problem. I'll be doing a little wire tracing and trouble shooting this weekend (it's too dark when I get home).
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bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L |
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