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A/C issue on a '92 Silverado

- Chevrolet-Silverado 1500 Pickup
Forum Post
03/30/09 14:40
Josh Lindauer

A/C issue on a '92 Silverado

I purchased my ’92 Silverado in Dec. 2008. Since I got it the temperature control display has been blinking “A/C” for 2 minutes after starting, than goes away. From the owner’s manual and the GM service manual I realize this means there is a problem in the A/C system. I figured that it was low on refrigerant since the compressor clutch would never kick on, that and that is what it typically has been in the past with other older vehicles. After buying the retrofit 134a kit, I recovered the stuff that was in it, then proceeded to add the new stuff. The pressure kept rising but the clutch never engaged. I looked through the GM service manual and they suggested to do the obvious…Is there power to the wires i.e. the cycling switch and the clutch positive wire. There was not. I inserted a jumper on the cycling wires figuring this would complete the circuit telling me if the switch was bad or not. With jumping the cycling switch I still had nothing, the clutch never engaged. My next thought was well maybe the internal clutch relay or the pump was shot. So I ran a jumper from the positive post of the battery, to the positive post on the clutch relay itself. Then the clutch kicked in, I sucked in the 134a and everything was working. I also did this to the cycling switch, when I added power the clutch engaged and all worked. This tells me I have an electrical issue and the mechanical stuff should work. I don’t believe that it would be the cycling switch because with it jumped it should engage the clutch of the compressor and it did not, In fact it did nothing with a jumper on the cycling wires. I assume that I have an issue elsewhere that is causing a dead spot in the system or else the cycling switch would have power to it. Does anyone have any ideas or faced similar situation or hell even heard of any stories remotely similar to this? I would really appreciate any help, short of taking it to a mechanic who is going to charge me way more than the truck is worth to get this working again. Thanks.
Archived Replies

This post has a total of 45 replies. The most recent 25 are shown below, you can view the complete archive here: A/C issue on a '92 Silverado archive. Your feedback, comments, opinions and questions are welcome and encouraged.

This forum post has messages dated from 03/30/09 through 03/16/12, please be sure to read all the messages. If you feel it is old or outdated, please follow up with a question or comment and someone may be able to update it, or reply with newer information if you have it.

21
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Tommy

I had the same exact issue. I disconnected the battery for 10 mins , turn the truck on, hit the a/c button and everything worked fine. Easy fix!
22
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Regina

I have tried everything. I have 12 volts of power to the a/c clutch all the time. I unhook the low pressure cycling switch connector and the 12 volts is gone to the A/C clutch but I still have 12 volts to the low pressure switch. I took out the fuse in the dash 25volts and I still have power to the cycling switch connector. I took all 3 relays out of the glove box one at a time and I still have power to the connector. I can't make it stop working. Any ideas? Is there anywhere esle I can check for a fuse or something. It is a 91 Chevy Silverado with no work done on the wiring. I just took the key out one day and the a/c kept working.
23
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Tyler

i have a 95 silverado and i just put in a new sterio and i pulled it out to look at something and all of the sudden my ac went crazy!! the ac would come on when the fan was off but when the fan was on it wouldnt work.... now the only thing that works is the fan... any suggestions? would the battery fix help?

24
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langley

1992 Silverado the A/C will come the compressor will cycle in the low fan setting but when it's switched to med or high it doesn't, is the fan some how connected to the pressure switch?
25
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Marcus

Need help, I have a 1992 Chevy Silverado and the ac just isn't as cold as it use to be. It always has to run on high. I just added some R12 last week but still not blowing that cold. Does anyone have any ideas?
26
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old fart

I picked up a 1992 chevy silverado pickup that had been sitting for 8 years.It has only 75k on it and runs great.The A/C didn't work and when I tried to charge it up, the A/C light stated flashing and the compresser stopped.I disconected the battery and tried again, the same thing happened, so I did it a third time and the compresser stayed running.I don't know why it started working, but I'm thinking the low pressure switch may have something to do with it, there may be a TSB out there that would help you understand what the real fix is
27
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Mark

Hi, I have a 94 1/2 ton GMC w/ 350. The AC compressor comes on at idle, but if I rev it up away from idle speed it short cycles. Either way, I don't really get any cold air. The little gauge on the kit I bought to recharge it indicates the system is charged sufficiently. Any ideas?
28
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Khris

okay i have a 1992 chevrolet stepside silverado and just had everything retroed over from R-12, to R 134. All hoses are good. The compressor is brand new...and now it won't even blow cold. All the swithces are good, none of them are blinking. I even had die ran through it to make sure there aren't any leaks. I can't find anything. Now underneath the hood it doesn't even sweat. What the hell is going on. accumulator is brand new...orifice tube is brand new.... sysyem was flushed prior to all this, and vacuum tested. Vacuum failed so thats why i bought a new compressor. So where do i go from here. I don 't know what to do...my guess is that its leaking from somewhere, , but from where..Can somebody help me out..what am i overlooking
29
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Chev Rebuilder

It's very important to make sure to put PAG oil in the new compressors, as they do not come pre-oiled. Not doing this could give a false head pressure reading (There is already about a 15 to 20% diff in the head pressure when you retro anyway) and as a safety precaution, the compressor would not kick in.

On the retro kits, , the o rings on the back of the compressor are notorious for leaking, that's why I always use a leak sealing formula on a retro. Other than that, try some of the other remedies listed here and make sure you didn't just get a bad compressor, it DOES happen from time to time.-Good Luck

30
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pos93k1500

everyone has figured out how to rig it up to work. I am looking for the relay to replace it. anyone know where it is? i have taken my dash apart looked all through the engine compartment. I have know clue where it is. the one advance gave me looks like it is mounted on the firewall or something but I have looked everywhere with no luck

31
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Impac41

If you mean the a/c compressor clutch relay, it is behind the glovebox. You will have to remove the box tray inside. There are three relays mounted on a piece of sheetmetal which is screwed to the a/c ducting.

On my truck the one in the middle is for the a/c clutch. I do not know how the old relay unplugs from the harness. If you look at the new relay, it may clue you in to how to disconnect the old one.

32
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BJ

1992 Chevy. The a/c head display quit working, done some troubleshooting and found a wire burned in half behind the glove box. Done the same thing as Mike described about...put an inline fues in as extra safety...but that fuse blows in about 4 minutes once i turn on the a/c. If the a/c is not on, then no problem, the wire is not carrying enough current to blow my inline fuse.

I assume i must have short somewhere. Does anyone have any insight as to the location that is causing the short...didn't know if there is a common spot that this occurs at. Any help would be much appreciated.

33
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lux blue

reply #29 is an easy, reliable fix. it's very simple, too. the green wire in question is the only one "in a corner' on the plug.

if you remove the wrong green wire, the head unit looks like a disco, and while you have cold air, it will only blow on your feet.

to remove the wire, you will need a small blade flat head screwdriver, and a stout piece of wire (or a terminal dissection tool if you're all fancy like me.)

step one (once the plug is out, that is) remove the orange bar from the back of the plug. do this by pressing in on the side with the flat blade screwdriver.

step two- with the plug facing you(for refrences sake, with the terminal in question in the upper right hand corner) slide the wire down the top of the spade while pulling on the green wire from the back, once the latch is tripped, it should come out with very little to no resistance.

fold it over and tape. for good measure, you should plug the control unit in and fire it up. you should have normal a/c functions. if not...you probably have another issue.

34
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Jason

I got a 92 Silverado 4X4. before I put in the aftermarket CD player everything worked, afterwords I got no power going to the AC/heater unit or the origional AM/FM unit. What the heck is going on here? Is it some sort of circuit that isn't being completed or worse? All the fuses are good and the wiring is good also. Checked voltage and thats good also.
35
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John

94 Chevy Silverado dashboard panel lights will not turn on. The fuse is good (5 amp panel). One night it worked and the next day it wouldn't. I think I'm going to replace the parking light/headlight/panel light dimmer switch.
36
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Coco

Unplugging the batter for 10 minutes, then plugging it back in and turning the truck on worked 4 me!
37
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Chris Biederman

Will 4 spd Climate Control Unit work on a 3 spd CCU?? I have the AC Recip On Button. The 4 spd has AC Max On. Chris
38
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Harry

I had the same problem with the A/C blinking turns out that the truck has a low pressure switch built in and the refrigerant charge is approx 3 lbs of freon. Witch is 46 oz the average rerigerant can is only 12 oz. But if the light is blinking you have to disconnect the battery to reset the system.
39
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DIRTY DAN

My 92 z71 a/c light blinks for a while then the compressor and the a/c light stop. I unplug the control head and plug it back in. The a/c works for about 20-30 mins then the same old thing.

I've put in a new pressure switch and filled with 134r (it's been converted). It still does the same.

40
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Charles

The unhooking battery fix worked for me, thanks
41
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Eddie

I HAVE A 1992 CHEVY.I HAVE THE SAME PROBLEM THAT EVERY BODY HAS. I PUT IN A NEW COMPRESSOR AND ( CONVERTED ) EVERYTHING TO A 134r. EVERY HOSE IS NEW.IT HAS LIKE 4 DAYS THAT I CONVERTED EVERYTHING. I NOTICES THAT WHEN I STARTED MY TRUCK THE A/C LIGHT STARTED TO BLINK. WHAT I DID WAS CHECK EVERY FUSE I HAD TO SEE IT WASN'T BURN OUT.SO NEXT THING I DID WAS I TOOK THE WHOLE A/C CONTROL UNIT OUT. THEN I NOTICE WHEN I UNPLUGGED IT AND CONNECTED IT BACK THE A/C LIGHT TURN OFF. THEN EVERYTHING STARTED TO WORK AGAIN. I HAD THE TRUCK RUNNING FOR ABOUT 15 SECONDS AND THEN I TURNED IT OFF. AND I UNPLUGGED IT AGAIN AND PLUGGED IT BACK. SO I REPEATED THIS STEP 2 TIMES. I PUT EVERYTHING BACK TOGETHER AND STARTED THE TRUCK ON AND THE PROBLEM WAS FIXED. AS OF TODAY I EVERYTHING WORKED GREAT. BUT WHAT I HAVE READ FROM EVERY BODY POSTING SOME WORKED FOR THEM AND SOME DIDN'T. SO THAT'S THE CHANCE YOU HAVE TO TAKE. LIKE I SAID MY A/C BLINKING LIGHT CAME OF BUT WHO KNOW IT MIGHT COME BACK ON AS FAR AS I KNOW. AND IF IT DOES I WILL DO THE SAME THING AGAIN TO TAKE IT OFF. OR GO TO A JUNK YARD AND GET A USED ONE FOR CHEAP AND TAKE THE RISK IF IT WILL OR WILL NOT WORK.
42
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PAUL

yes the disconnecting of the battery is a good fix thank you 2 everyone who was a part of this welcomed fix. no more frying my a#@ off in tucson az . thank you again
43
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Texas
Thank author of this post/comment"A / C "on" blinks on a '92 Silverado"

This a/c light on the dash control panel will blink off and on when the compressor has cycled off and then back on for 10 consecutive cyles due to a low refrigerant charge(through a low pressure swith). After which the compressor will not restart-the controller has locked the compressor circuit out. The purpose of this lock out is to protect the compressor from being damaged for a low refrigerant charge. You can disconncet the battery for say 10 minutes and them reconnet it, resetting the contoller 0 cycles and the compressor will restart but the controller will again lock out after 10 consecutive "on/off" cycles.

Here is the other time in which the lockout will occur:

If you are driving the truck with the a/c on and towing a 5000-7000 lb trailer and it's 100 df outside temp and the engine is getting warmer than you are comfortable with; you deceide to turn the a/c on and off during your trip (to keep the engine temp normal) the controller will, after 10 cycles of your "on and off modes" will lock out the compressor and you cannot restart until you disconnect the batttery for say 10 min and then reconnect it. There is no low refrigerant issue in this case-your actually cycling the compressor -and not the low pressure switch-this is the glitch in the controller program.

44
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Winnsboro, La
Thank author of this post/comment"92 chevy A / C problems"

I have been through all of these problems with my truck. There is a red power supply wire with a connector behind the glove box that got too hot and melted. Also, there is a pig tail off of the wiring harness where the connection for the climate control module hooks up. It is a 4 wire plug with a black, 2 brown, and 1 tan wire. It also shorted out and got too hot.

Had to replace both plugs and everything is working fine now.

45
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North Carolina
Thank author of this post/comment"1991 Silverado A / C Compressor runs all the time "

My 1991 Silverado A/C Compressor runs all the time. This is a problem that has just started in the past week.I put a new A/C hose assy. on and recharged and the A/C now is cold but it don't cycle like before. Could this be a bad Low pressure cut out switch sticking in the position to make the compressor run all the time with out cycling? By the conpressor running all the time, it now is causing a bad vibration & simi stalling of the engine when the truck is at idle rpms in drive holding the brake at stop lights. Could I have to much freon in the system causing these problems? Last year, I put a New A/C Compressor, Dryer and orfice tube also flushed the system before charging and have had no problem until until the past week as stated above. Please help me figure out what could case the compressor running all the time and the vibration and partial stalling of the engine at idle rpms. Thanks Chris
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    Archived Replies

    This post has a total of 45 replies. The most recent 25 were shown above, you can view the complete archive here: A/C issue on a '92 Silverado archive. Your feedback, comments, opinions and questions are welcome and encouraged.

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