Here's a video of my R53 (new owner) running with an AC manifold attached. Notice the High side bounces from 150 to 250psi in a cycle with the fan kicking on. Low side wanders around 30psi. Shop was at 60degF


Does this indicate a blockage at the expansion valve? Or is there a sensor that runs the expansion valve that could be faulty?


AC blows cold but not freezing cold. Maybe 50degF (I need to put a probe in a vent still).

 

Was the system ever filled without getting a full vacume after being opened for service (a new drier is always used)? Failure to do this step (just filling) results in sub par performance from the remaining air, and the moisture in the remaining air can cause a compressor failure, or ice up the expansion valve....if the compressor oil looks like black or gray sludge....its too late...
Typically the system is vacuumed, and the driver is examined...if there are chunks from a failing compressor, most items a changed out, but a flush can be done...depends on the cars design...often diy ac service is penny wise pound foolish unless you have a shop pull the vacume for you....

 

I don't know the prior service history (I've had this car for only a month). I found the clutch coil unplugged and the connector unmounted. So I'm not sure what that tells me. Either someone wanted to render it inoperable or was lazy. The clutch also has a hex bolt on the end, and I think OEM is a torx (?). If so it looks like the coil was changed.

 

Might be able to stroll over these tech forums for an answer or post a new one with a question and a technician should pop in and answer with his idea as well.

-Luccia

 

Thanks Luccia. Gave that a try, but I'm still looking for someone that has seen this before.

 

Hope they are able to help. If not, please don't hesitate to give us a call and speak with a specialist over the phone. Good luck.

-Luccia