NO AC LIGHT COMPRESSOR NOT ENGAGING
1997 Chevrolet Suburban • 175,000 miles
I am trying to get my 97 K1500 Suburban AC working. When I purchased the truck, I new that the AC did not work. The previous owner told me that the compressor locked up, so he changed to the shorter belt and moved on. Now that I've moved to FL, I need the AC. While changing out everything I found that the rear ac has been disconnected and the shared pressure hose obviously changed out. I bought all new parts (accumulator, compressor, condensor, low pressure switch, high pressure switch and orafice tube filter). I'm not gonna worry about the rear air, I'll just be happy to have the front ac working at this point. Now that I have everything installed on the truck, I vacuumed out the system and it holds. The problem that I'm having is that my dash light is not coming on and the compressor is not engaging. I checked and I have no power at the low pressure switch. Checked all fuses and relays, everything is good. I'm not sure where to go next. I've read several things about checking the control head in the dash, which I may try next. This may also be relavent, the 1st and 3rd settings don't work on my fan settings.
July 28, 2012.
July 28, 2012.
Alright lets this again the black wire with a white strip is supposed to have a ground it.That is the ground for the ac relay when the switch is tripped it turns the ac clutch off from the relay side.Also the ac compressor isnt going to come on or stay on till there is enough pressure in the system like i said in a earlier post.I hope this makes sense now?
But isn't power initiated from the control head? Should I not have power to the plugs? I have no porblem ground anything directly to the damn frame at this point, I jsut want the ac to work. I can't put freon into the system without any power, because when I tried that before, the low pressure just kept going up. If the compressor doesn't cycle then I can't keep putting freon into the system. That's why I tried to jump the compressor. I'm about to run a switch to battery power and hook it up to the compressor or just jump the thing again. At least when I did that the compressor would turn on. I'm still curious how I'm supposedto find out where the ground issue is at and why I don't have any power. Now it's too late in the day to head to the junk yard to find a new head unit. Ugh...... This is so frustrating and I feel like I'm getting no where at all!
Great, now we have a wonderful Florida monsoon! Ok, do you have a procedure for checking power to the system? Should I start at the control head (key on/ key off) and report findings.
Ok, I took your advaice and i worked! 3 cans and I've got 48 lbs. low side and 195 lbs. high side. The reason that I was questioning was becuase I tried the same thing before and the low prssure side just kept going up and the compressor NEVER cycled. That was another compressor that I had purchased from Advance. I took it back and ordered everything online to save some cash. Maybe I just had a "bad" new compressor before. That's why I've been so puzzled and why I didn't want to keep throwing money away. No matter what, it's working now and I'm so happy. Thank you so much for all your help. I'm glad that I didn't go get a new control unit to boot.
Your welcome thats what were here for.Iam glad you finally listened i have been working cars since i was kid.I really try not to waste peoples money also looks like one more 12oz can of charge and you will have a full charge sine yours holds 3LBS or 48ozs.Also i hope you added some dye like i said in case you have a leak somewhere?Glad to hear it worked out you just needed a like guidance.
You think I should add one more can of freon? Even though I had 49 lbs low side.
The system without rear air holds 3Lbs i always put in what the system holds.
Jul 29, 2012.
Jul 29, 2012.
Ok, I'll pick up another can and install. So just put the 4th can in and don't worry if my low side pressure goes up? Is there a pressure that I should consider too high? Thanks.