Wow what a nightmare! I don't know of what else to check and I work on AC's all the time!

 

Your telling me!! It doesn't make any F'ing sense. The only thing I didn't replace with new were the evaporator, ac lines, and AC relay. Maybe I should throw a new relay on just for the hell of it.

Wouldn't you think if the bov is relieving pressure, it must be be building too much pressure in the compressor. That tells me that either the fans aren't dissipating enough heat or the compressor isn't cycling like it should..? So maybe the relay isn't letting the compressor cycle. ****, I don't know. I'm not an ac expert

 

Whats the head pressure running that will tell you what direction you need to be looking. Could be a weak high pressure relief also. I have had them go bad before many times through the years.

 

By head pressure do you mean high side pressure? If so, I will have to buy some gauges to put on the thing.

 

Autozone has some cheap 134a gauges to buy if u have to. Head pressure - high side. Suction pressure- low side ( blue hose).
Now if u took it to a Ac shop and had them charge it u Would think they knew what they were doing however I have seen some pretty poor techs. Uhh I don't think they have a bov in the comp. But they do have a high pressure switch I think, or at least I have seen some vehicles with them. If it has to much gas in it the compresser will cycle on and off constantly with the hood open u would be able to hear it doing so.

 

Yea the a/c shop here in town has been there forever and is the best in town. I don't doubt them one bit.

Anyway there is a snap ring holding a silver/aluminum plug in the back of the compressor. It looks like a pop off valve or something like that to me. Anyone know what it is? That is what I thought was relieving pressure from the compressor but that could be wrong and probably is.

The compressor doesn't seem to cycle. Everytime I've popped the hood to try and see it cycle on and off, I only have been able to see it on and running. I haven't seen it turn off yet but then again, maybe i'm just impatient.

 

IIRC those popoff valves are not serviceable. If it pops due to too much pressure in the system, it releases all refrigerant from your system and you need a new compressor.

 

Good to know. Then I guess I can rule that out.

 

The bottom pic shows the relief I was talking about. You can see it is held in there with a snap ring. Thanks smokeshow for ruling that out as the culprit.

 

Could u unplug it and check the voltage at the connection with the ac button on and off. Most cars send a 12vdc to the compressor to activate it.