2005 Subaru Impreza Wagon, AC out

[lmdew]

I had it service Nov 2024 after replacing the Evaporator due to a leak.  

Worked great till the other day.  Then NO AC.

No leaks and when I hook up the cheapo service gauge pressure is High, in the red.  

I pulled the AC Relay and jumped it.  AC compressor kicked in and the gauge went into the green.  

I'll take it back to the service location, just thought I'd put this out there to get your thoughts.

Thanks,

Larry

[88SubGL]

13 hours ago, lmdew said:

I pulled the AC Relay and jumped it.  AC compressor kicked in

Was the air in the cabin getting cold? If so, it sounds like something in the wiring or possibly a low pressure switch, but I’m not an a/c tech by any means. 

[nvu]

If it's the single gauge one on the low side only.  Yes it would read high, around 80-90psi when the system is off.  Not much else to add about why it's not kicking on, but it's normal to see it high on a single gauge reading.

Thinking it's more electrical than a system problem.  Did you swap the relay with a similar one on the car yet?

[lmdew]

Yes swapped the relay no change.  I'll dig into it a bit more.  When I jumped the AC and the compressor kicked on it was getting cold.  Thanks

[nvu]

If it's the old school manual air, check the pressure sensor.  It's somewhere on the condenser high line.  Short it and see.

The temperature sensor is some feedback transistor, you can't short it to test.  Unlikely as it only cuts out when the temp is too cold.

Unlikely the AC switch itself is bad, you can bypass it and force AC on by turning to full defrost.

No idea where to begin with the auto climate control, never had to deal with one.

Edited 5 hours ago by nvu