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Re: [GMCnet] a/c compressor not engaging [message #345191 is a reply to message #345170] Fri, 12 July 2019 13:59 Go to previous messageGo to previous message
Deb is currently offline  Deb   Canada
Messages: 349
Registered: October 2016
Location: Logan Lake, BC
Karma:
Senior Member
Hello all. I do have a gauge in the recharge hose so I have been able to note the low side pressures. Problem was that with the compressor toggling on & off repeatedly every couple of seconds or faster, I never got to a steady running pressure yesterday. It was continually flipping between running (when it the gauge would start to drop and then right back into non-running, when the gauge would start to climb again). That was why I couldn't determine a running pressure. I only put 1 can in yesterday since it was reading '0 psi' running once I bypassed the low pressure switch. It was after that I got the oscillating on/off and fluctuating low side pressure - because I had reconnected the switch. The reason I was asking earlier about static pressures was because not knowing exactly how much refrigerant was remaining after my winter loss, and the inability to get a running pressure, the only thing I had was the static pressure to go from.

This morning I tried first by-passing the switch. The clicking disappeared. It was running at 10 psi, so I slowly added one can. The thermostat was toggling on & off every minute or so. Got the running pressure at 18-20psi.
Cold air inside, but then I thought I heard a hiss coming from the line coming out of the evaporator and thought I felt a leak at the threaded connection. Wasn't there yesterday. Pressure started dropping very slowly. I went inside to get my "bubble bottle".

Came back out - no hiss, no bubbles. But also the tube coming out of the receiver was no longer cold though it was still cold at the evaporator. Seems like the compressor shut off and so did the flow of refrigerant. The low pressure switch was still by-passed.
Went inside the coach and was getting a smell from the vents. I turned off the a/c. Rechecked back outside, no leak no hiss. Back into the coach and turned the blower onto vent - no blower. I no longer have any blower with vent, heat, defrost or a/c Sad

I have reconnected the low pressure switch. Waiting to see if something has over heated due to coolant loss (probable leak), the lack of flow (freeze up?) and the by-passed switch, and some internal breaker might reset once it sits and cools off. My feeling is probably not. My luck won't be that good.
Just went out and checked - still no blower. Blower relay? There is a faint smell of hot plastic/rubber in the hatch.

Smell is coming from the blower motor. Just checked and the blower works (went straight from battery to hot connector and she fired right up. Thanks Rob Wink ). So... somewhere between A & Z. The blower itself might want to be replaced. I may pull it (give it a try) and see what kind of shape everything is in there. This is the second time I have had a burned out 'something' this summer related to the blower. Perhaps it's pooped and the everything else needs to work too hard to push it. Dunno. Give it a clean out, see if it turns freely. Maybe replace it, or brushes?. We'll see. But first have to figure out where the current 'no run at all' problem is coming from. I no speeds at all, with a/c, heater, vent or defrost.

Deb McWade Logan Lake, BC, CAN GMC Alumnus It's Bigger on the Inside!

[Updated on: Fri, 12 July 2019 15:05]

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