Need help on a A/C issue

[tooslow_4_u]

I'm trying to fix the AC in the G, and I'm stuck. I cant figure out a problem. Here is the basic scenario. The AC blows hot air. I found that the compressor isn't turning on. So i jumped it to see if it was bad, and it would turn on when I put direct power to it, so the compressor isn't bad. I checked the FSM and it said that the Refrigerant pressure sensor may be bad, so i replaced that and it still wont kick in. there aren't any leaks that i could find, but I did cycle some dye in the system to locate if I have a leak, and so far I can't find one. Now when I jump the compressor the ac does start to blow cold, but I cant figure out why it won't turn on normally. Any ideas?

[saywat?]

bad relay? nah idk nothing bout this

[4DZC]

Actually Saywat may not be too far off. There are realays which power on the A/C compressor, and running power directly to the compressor does bypass them, so you will want to check them. Should be under the hood in the fuse box. Try to locate it and another relay exactly like it and swap them out, if it works, take the old relay and replace it with a new one. If it still doesn't work there is a great possibility that you may have some wires from the fuse box to the compressor via the compressor harness that are either broken, burned, or otherwise damaged. Happened to my daughter's car. I found the issue (melted wire because A/C compressor seized) and repaired it. Slightly different cause, but tracing the issue like this is the same.

[tooslow_4_u]

I'll test the relay tomorrow

[702L32]

gotta start with the wiring from the compressor and work your way back up to the switch in the car. see what could be wrong along that route. usually bad wires or their connections, relays, fuses or switches are the culprits if the unit itself is working with straight power. I hate figuring out electrical problems

[tooslow_4_u]

I'm not about to cut open the wiring harness trying to find any breaks. I will be checking the fuses and relays first. I hate electrical problems too. Especially when it's something that isn't easy to trace because so many wires are loomed together

[gameguru1360]

you've already got an estimate from an a/c repair place on how much it would cost to fix it??

[tooslow_4_u]

I'm not going to take the car to any shops. I'm sure i can figure it out

[4DZC]

No one said you had to Slow...lol All you have to do is perform a continuity test on each of the wires from the fuse box to the AC compressor switch. If the test proves a lack of continuity on either wire you then WILL have to open the flex loom up and locate the damage wire in order to fix it. Remember, think smart not get out smarted. lol......

Originally Posted by tooslow_4_u

I'm not about to cut open the wiring harness trying to find any breaks. I will be checking the fuses and relays first. I hate electrical problems too. Especially when it's something that isn't easy to trace because so many wires are loomed together

[tooslow_4_u]

I Know, im talking about if I find something in the harness is bad, then i have to do that, and I have no desire to do that. I'm hoping it's just a relay or fuse.

[4DZC]

Lol, good luck with that! You know NOTHING is ever easy with this platform Slow.

[tooslow_4_u]

Luckily it's not summer anymore, so i don't really need to fix it right away. But i'd rather fix it now so i don't have to wait till summer when its hot as hell outside trying to work under the hood of a car.

[702L32]

have you found anything related to this issue on the G forums?

[tooslow_4_u]

They only suggested the pressure switch or a relay

[tooslow_4_u]

I can't believe what was cause. It was the fuse. I didn't think it was because it wasn't blown. Turns out the dealer put in the wrong style fuse when they checked it a few years ago. the put in the bladeless microfuse instead of the bladed microfuse. Aint that some shit