I have a 2008 Is 250 just bought few months ago. Once the weather warmed up I noticed the a/c wasn't working. Checked the refrigerant and it was full but compressor was done.
So I replaced compressor, condenser and did a full Evac and recharge. The system was ice cold. Now less than a month later randomly the a/c goes out.
Light on the dash still working, compressor at idle kicks on and off. As the compressor kicks on and off the fan mimics it. So you can feel bursts of cold while the compressor is cycling on and off. I tried to raise rpm at idle but does same thing. Now tomorrow the A/C may work just fine. But I don't know what could cause it to randomly go out like this.
I don't know if at idle the compressor suppose to shut on and off like that. Or what would cause it to do that. Any help here is appreciated.

 

Any help is appreciated

 

I don't know what is wrong, but I can tell you that the compressor is not supposed to turn on and off in normal operation. It is a variable displacement design that changes capacity in response to both engine and cooling loads.

 

Yea after it started working again normally I noticed that it stays on. Just need to figure out what could cause it to do this.

 

Could be a bad pressure switch.

 

Isn't the switch attached to the compressor? If not weed is it located?