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05-31-2011, 08:35 PM
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#1 |
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Registered User
Join Date: Apr 2011
Location: northern california
Posts: 123
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heater controls freaking out
ok heres the deal.
my 88 chevy pickups hvac controls will go crazy. everything will flash and the a/c will go on and off repeatedly and will get stuck on defroster. the only way to get it to stop is to pull the fuse, which leaves me without a heater or defroster. it used to be that if i leave the fuse out for a couple hours it would go back to normal and work fine, but now if i put the fuse back in it will just start freaking out again right away. could this be the controls in the dash or could something else cause it to do this? |
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06-01-2011, 07:24 PM
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#2 |
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Old Skool Club
 
Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: heater controls freaking out
Not abnormal. Check out O'Reilly's Auto Parts (on line) and see how much they sell the control head for. They're available remanufactured.
__________________
Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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06-01-2011, 10:33 PM
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#3 |
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Registered User
Join Date: Apr 2011
Location: northern california
Posts: 123
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Re: heater controls freaking out
thanks, ill look it up.
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06-13-2011, 06:39 PM
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#4 |
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Registered User
Join Date: Apr 2011
Location: northern california
Posts: 123
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Re: heater controls freaking out
ok, so i went to the junkyard and grabbed 4 control units. i figured why not? ill have extra.
same problem. i pulled the digital heater controls from my uncles pickup and changed the relays behind the glove box. i know all this stuff works. same problem. any other ideas? |
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06-16-2011, 11:26 PM
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#5 |
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laying low
Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 12,997
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Re: heater controls freaking out
Has anyone changed out the radio or added audio type equipment?
__________________
Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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06-17-2011, 04:23 AM
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#6 |
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Registered User
Join Date: Apr 2011
Location: northern california
Posts: 123
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Re: heater controls freaking out
nope, truck is bone stock.
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06-17-2011, 11:28 PM
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#7 |
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Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: heater controls freaking out
Mine was doing that and I replaced the control module and it fixed the problem. There was a TB out for the '92 trucks that said this was a common problem. One thing I also did was clean the connection ends on the wire to the controller.
__________________
'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
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06-18-2011, 03:05 AM
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#8 |
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Registered User
Join Date: Apr 2011
Location: northern california
Posts: 123
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Re: heater controls freaking out
by control module you mean the unit that is in the dash below the radio?
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06-29-2011, 09:43 PM
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#9 |
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Registered User
Join Date: May 2009
Location: Saginaw,MI.
Posts: 87
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Re: heater controls freaking out
mine acts up when I switch on the running lights,or headlights.....
digital all dancing everwhere
__________________
www.michiganstreetandstrip.com |
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06-29-2011, 10:45 PM
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#10 |
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Old Skool Club
Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: heater controls freaking out
Could be a grounding issue, or it could just be a symptom of the control unit taking a dump.
__________________
Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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