A/C Compressor sometimes does not turn on
 

Just had the system completely vacuumed and refilled - When the compressor turns on, it works great. But about 1/4 times, it just will not engage until about 15-20 minutes later. I can't figure it out. Does anyone have any ideas why the compressor would wait to turn on, if the pressure checks out fine?

Thanks,
Geoff

Re: A/C Compressor sometimes does not turn on
 

I'd try pulling codes from the climate control unit; it's ridiculously easy. See the attached (toward the end).

Re: A/C Compressor sometimes does not turn on
 

Looks like it's reading a Code 15 - Refrigerant temp sensor open

Is this something I can take care of, or should I take it to the Subie dealership?

Re: A/C Compressor sometimes does not turn on
 

http://serial.cc/pdfs/AC___HEATER____AUOTMATIC.pdf

See page 22 for the location of that sensor. Probably not the easiest thing to get to, but you could get lucky and it just be a loose plug or something.

Re: A/C Compressor sometimes does not turn on
 

So I have to remove the glove box, and it's somewhere down there? My guess is that the system would need to be evac'd beforehand?

Re: A/C Compressor sometimes does not turn on
 

I'm not exactly sure how to change that sensor out. I'd first get a replacement sensor and then evac the system, then take apart as much of the dash/glovebox area and swap it out. Test it before putting it back together.

Re: A/C Compressor sometimes does not turn on
 

I wouldn't think it would be necessary to evac the system...

Keith:cool:

Re: A/C Compressor sometimes does not turn on
 

Keith - Have you done the sensor replacement before? I'm just trying to figure out its complexity. I haven't even seen the evaporator core yet. :)

Re: A/C Compressor sometimes does not turn on
 

I would first make sure that the system is properly charged. I have been told that when they are not properly pressurized it will cause compressor to act sketchy.

Re: A/C Compressor sometimes does not turn on
 

It is. When the compressor does run, it's perfectly charged - Just had a local shop take care of that.

It's just that the compressor won't run sometimes...and the HVAC is giving me code 15.

Re: A/C Compressor sometimes does not turn on
 

That's just what I would do because I don't know any better :).

$5 says there's a loose plug that's preventing it from working.