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#1 |
Registered User
![]() Join Date: Apr 2013
Location: San Antonio TX
Posts: 424
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No High with my AC... What is it?
Been working on my AC, got it all going but have no High? I think its 4 speeds right.. when I try to put it on high it does nothing. AC resistor maybe, or something else? Let me explain better.. when I switch it to high it turns off.
Eric
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If I see a Zombie.. Im runnin it over with my Truck. |
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#2 |
1969 Custom 30 wrecker
Join Date: Sep 2001
Location: Pottsville, Pa
Posts: 2,611
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Re: No High with my AC... What is it?
I believe there is an inline fuse somewhere that if it blows out, the high speed stops working.
On Chevelles I think it runs across the firewall but not sure where on a truck. Might be the same place.
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Bob 63 Impala 283/PG/3.36 (under restoration) 66 Impala 327/PG/3.36 66 Chevelle SS 409/M22/3.55 69 Chevelle 307/PG/3.08 (future restoration) 69 C10 short stepside 454/TH350/3.73 69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!) 71 Cheyenne 20 fleetside 350/4 spd/4.10 71 Chevelle 6/PG/3.08 72 Chevelle 454/M21/4.10 |
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#3 |
Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,561
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Re: No High with my AC... What is it?
Just fixed mine from info on this forum. It was a bad connection at the fuse block on the good fuse. Look for the big orange wire coming from your a/c going into the side of your fuse block and then pull the fuse. I just pushed a good fuse onto the bad one and the fan went on. From there I pulled it all out and fixed the issue.
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70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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#4 |
2WD Jimmy
![]() Join Date: Mar 2005
Location: Davis County, Utah
Posts: 2,564
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Re: No High with my AC... What is it?
When one speed doesn't work, it's usually the switch.
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#5 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,218
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Re: No High with my AC... What is it?
There is a relay on the engine side around the evaporator unit or firewall. This takes the excessive load of high blower off the ign switch & A/C controls. There is a fuse inline on a heavy gauge wire near this relay. Use a test light to trace it. If the fuse is good the relay is probably bad.
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#6 |
Registered User
![]() Join Date: Apr 2013
Location: San Antonio TX
Posts: 424
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Re: No High with my AC... What is it?
Ok Ill start checking it all out. Thanks everyone for the info... process of elimination now.
Eric (Evaded)
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If I see a Zombie.. Im runnin it over with my Truck. |
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#7 | |
Registered User
Join Date: Aug 2002
Location: Muskogee, Oklahoma
Posts: 2,914
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Re: No High with my AC... What is it?
Quote:
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#8 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,006
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Re: No High with my AC... What is it?
The relay is your likely cause. They are not expensive and are easy to replace.
Posted via Mobile Device
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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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#9 |
Have A Nice Day!
Join Date: May 2003
Location: California
Posts: 356
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Re: No High with my AC... What is it?
High speed relay
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1970 CST K10 350/350/205
Short Bed - Fleetside Tach-Tilt-A/C-Tow Hooks Front & Rear Disc Brakes Front & Rear Posi 3.73 Gears 30 Gallon Stainless Fuel Tank SOLD 01/18 !!!!! 2007 2500 HD Classic Crew Cab LT2 4X4 Duramax LBZ ![]() ![]() |
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#10 |
Florida Edition
![]() ![]() Join Date: Oct 2010
Location: Fruitland Park, FL
Posts: 4,025
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Re: No High with my AC... What is it?
In the cab under the glove box mounted on the ac box.
Posted via Mobile Device
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70 GMC Short Stepside "Rose"-An American Beauty: Factory 402/TH400, AM/FM, AC, Tilt, Tach, Buckets, Posi, PS, PB, 3-5 Drop, Complete Resto-Rod 67 C-20 Slant Back Wrecker "Mad Max" 67 C-10 Ratrod "Step-N-Wolf" 71 Serro Scotty Sportsman camper "Scotty" 97 LT1 Z28 "The Hornet" Link to more pics of "Rose" http://67-72chevytrucks.com/vboard/a...p?albumid=1684 Check out my "Cheap Tricks" thread and add to it if you can, lots of good info there. http://67-72chevytrucks.com/vboard/s...d.php?t=489394 |
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#11 |
Registered User
Join Date: Oct 2001
Location: Grapevine, Tx.
Posts: 2,142
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Re: No High with my AC... What is it?
Evaded,
When I had this problem it was the ground wire from the relay on the inside firewall behind the glove box up high on the passenger kick panel side. You may have to remove the Glove box liner to see this relay There is a short ground wire with a ring on the end that goes to one of the bolts that hold the inside heater box to the firewall. Mine had been left disconnected after some heater service Easy test just run a ground to the frame from the relay while the fan switch is on high Fan speed symptoms were: Low =low Med=Med High=Very slow
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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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#12 |
Registered User
![]() Join Date: Apr 2013
Location: San Antonio TX
Posts: 424
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Re: No High with my AC... What is it?
Thanks Hutch.. made sure that was hooked up when I installed my new duct work for AC and glove box. Will keep eliminating above responses. Thanks everyone so much.
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If I see a Zombie.. Im runnin it over with my Truck. |
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#13 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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I just fixed mine also. I took the switch off and took it a part brushed it real good. Crimped the spade connections really tight with a set of vise grips and put it back together. It's been working ever since.
If the spade connections are loose and wiggle that means heat build up and after a while it want fuction as it should. ![]() ![]()
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#14 |
Registered User
![]() Join Date: Apr 2013
Location: San Antonio TX
Posts: 424
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Re: No High with my AC... What is it?
Hmmm... thanks^
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If I see a Zombie.. Im runnin it over with my Truck. |
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#15 |
Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,561
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Re: No High with my AC... What is it?
So what did the trick...? Inquiring minds want to know!
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70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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#16 |
Registered User
Join Date: Jan 2011
Location: Townsend MT
Posts: 1,725
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Re: No High with my AC... What is it?
When I got my truck the wire was unhooked and hid up in the dash.
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#17 |
Senior Member
![]() Join Date: Aug 2011
Location: Reno, Nv.
Posts: 1,434
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Re: No High with my AC... What is it?
Mine was the switch.
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1927 Willy's Knight 24,000 original miles, 1958 Impala 283/Powerglide, 1964 C-30 383/4 speed, 1971 Monte Carlo 350/350, 1972 GMC K2500 350/350, 1976 Chev. K10 350/350, 2006 GMC Sierra 2500HD LBZ Duramax/Allison, 2006 Chev. Silverado K3500 LBZ Duramax/Allison |
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