I just installed a new compressor and added 2lb of R-134A. My High side pressure is around 300, a/c doesn't cool well, and the engine starts getting hot in traffic. I'm reasonably confident I accidentally installed too much PAG150. New compressor had 4oz and I added 2oz to the new receiver/dryer and 1oz in each hose for a total of 8oz. However, I didn't completely remove the hose that runs down to the compressor. Maybe it had oil trapped in it? I also replaced the expansion valve and pulled vacuum on the system for several hours. Any advice?

Thanks,

Loren

 

Do the fans come on when you turn on the A/C. High head pressure, poor a/c cooling and the engine getting hot in traffic are all symptoms of the fans not running.

 

Thanks, I'll check it out.

 

Yep, that was the issue. one fan wasn't coming on. Thanks for saving me a bunch of time and money!