Thread: Air Conditioning Problem

I had my engine replaced about a year and a half ago when I discovered the previous owner had loaded the vehicle with stopleak after cracking the block. (Hey, it held for nearly 30k miles, not bad!)

Prior to replacing the motor, my AC worked fine. Afterwards, it didn't work anymore. I'm guessing that the guys who did the work emptied it and didn't fill it up, or pinched a wire somewhere. I'm hoping for the former.

Anyways... I noticed the AC clutch doesn't kick in at all, so I can't get it to suck in any extra coolant. What is the easiest way to bypass the low pressure switch so that I can fill the system up?

What exactly are you trying to do here? Have you put the system on a vacuum pump? You should almost be able to put enough in without having to start the system up.

if you jumped the relay and it worked it has to be the relay i would think

Thats what I thought too, but I've tried a new relay and that didn't do it. I'm going to test the relays I have with a multimeter tomorrow.

Just to clarify, when I say jumpered, I mean that I used a paperclip to bridge the connections in the socket where the relay goes, not sure if I'm using the correct verbiage there or not.

Thanks!

EDIT: Actually... I just went and tried two more relays. No difference. I also stuck a new fuse in Fuse 28, which is labeled A/C CLU/ABS IGN on the schematic I have. No dice.

Here's the schematic I was looking at:

Maybe your controls aren't working right?

If there it's no r134a in the system recharge it with a can with uv dye in it and the dye will show where your leak is

Jumping a relay does not imply it's bad. It typically means the relay is not being actuated normally. Test for power and ground to actuate a relay and you'll know what is missing. From there you can trace things back.

The pcm will not try to turn on the compressor if the system does not have freon.