On my 1988 Mazda truck, and my 1998 and 2004 Nissan Frontiers - all which have expansion valve systems - the de-icer switch on the evaporator case (which has a sensor in the evaporator fins) makes their compressors cycle.

Back then, didn't most add on units use an expansion valve?

I replaced compressor only on our 2005 Yukon as the compressor did not seize.

I replaced compressor, condenser, drier and flushed the lines when the compressor in my 2004 Frontier seized. So depends on the individual situation.

purged gauge lines and the orange smelling flush came out of gauges. Sounds like you didn't remove all the flush solvent. Is there a way to get moisture out of condenser and drier and compressor? Moisture should get boiled out of condenser and compressor by sufficient vacuum/duration. But drier pel...

As to YouTube help: some stuff there is OK, some is not. One has to evaluate based on credibility, and what others post. This is a 100% true recent example: Scotty Kilmer had some video of cleaning a catalytic converter with lacquer thinner. My brother in law thought this was a good idea, and Mrs. C...

Disclaimer: I'm NOT a certified AC tech, and do not consider myself an expert. First, here is the link to the discussed video. https://www.youtube.com/watch?v=RIiKPm3f75k My own opinion is that proper evacuation removes air from the system (about 78% nitrogen and 21% oxygen) which takes up volume in...

rpctmc154 wrote: there is a small hissing sound coming from the passenger side condenser.

Do you mean "evaporator", like under the dash?

I start the compressor and see press changes high side goes up.to near 200psi and low towards 25. Sounds to me like a little low on R134a. As to both fans being on when AC is switched on, I would "think" yes, but I don't know. I think both electric fans come on with the AC on our 2005 Yuk...

Thanks for having the ball$ to follow up and admit an error. Congrats on getting this working better !!!

Is it possible that the coil is weak and letting the clutch to slip and causing it to make noise? If clutch is slipping, that should be evident visually. I just last month fixed an intermittent slipping AC clutch on my 1998 Frontier. I removed a shim under the drive plate, and now it works fine. Wh...