Search found 78 matches

by mk378
Thu Oct 13, 2016 9:29 am
Forum: Automotive Air Conditioning Forum
Topic: 2011 Ram Compressor not kicking on
Replies: 9
Views: 1540

Re: 2011 Ram Compressor not kicking on

Don't run the compressor without a full charge.

You know that the charge is gone, all of a sudden because something sprang a leak. Take care of that and it will work again.
by mk378
Wed Oct 12, 2016 4:11 pm
Forum: Automotive Air Conditioning Forum
Topic: 2011 Ram Compressor not kicking on
Replies: 9
Views: 1540

Re: 2011 Ram Compressor not kicking on

30 psi with the compressor having not started is not good. You have a leak-out. Static pressure at 70 F should be about 70 psi. The switch needs about 45 psi to be certain to close.
by mk378
Tue Oct 04, 2016 3:04 pm
Forum: Automotive Air Conditioning Forum
Topic: 1989 F150 A/C freezing at Orifice tube
Replies: 5
Views: 1246

Re: 1989 F150 A/C freezing at Orifice tube

Subscription required to view picture.

Have you confirmed the compressor cycles off when low side goes below 25?

Many R-12 vehicles did not have a high side switch. Those only function to cut the compressor off before a hose or something else blows out in an abnormal situation.
by mk378
Tue Oct 04, 2016 2:59 pm
Forum: Automotive Air Conditioning Forum
Topic: Both sides Low
Replies: 2
Views: 818

Re: Both sides Low

You need a full charge to evaluate compressor performance, so yes like you said eliminate the leak then go from there. You will probably find the system is OK once not leaking and fully charged. So, find the leak. When it leaks out that fast you can usually find it by just putting a little refrigera...
by mk378
Fri Sep 23, 2016 7:02 am
Forum: Automotive Air Conditioning Forum
Topic: 2006 Jeep Wrangler Recharge problem
Replies: 4
Views: 919

Re: 2006 Jeep Wrangler Recharge problem

Your low side coupler is not working to open the valve in the car, so there is no way for refrigerant to flow to charge or to get a valid pressure reading. This often happens with one particular brand of cheap tools. When you start from an empty system, always charge by weight. If you charged to the...
by mk378
Tue Sep 20, 2016 7:51 am
Forum: Automotive Air Conditioning Forum
Topic: 1989 F150 A/C freezing at Orifice tube
Replies: 5
Views: 1246

Re: 1989 F150 A/C freezing at Orifice tube

Unplug the cycling switch while it is running-- this should make the compressor stop. If it does not, troubleshoot the electrical problem. If it does, the switch is probably bad. Make sure the switch is screwed on all the way (hand tight only though), as it needs to be all the way on to open the shr...
by mk378
Fri Sep 16, 2016 8:14 am
Forum: Automotive Air Conditioning Forum
Topic: Help with variable displacement dual evap system!
Replies: 7
Views: 1373

Re: Help with variable displacement dual evap system!

Whenever someone reports they see the high side a lower pressure than the low side, that almost always means that the couplers on their manifold aren't engaging the ports on the car properly.
by mk378
Sun Sep 11, 2016 9:37 am
Forum: Automotive Air Conditioning Forum
Topic: Diagnosing expansion valve stuck open vs faulty compressor?
Replies: 12
Views: 3753

Re: Diagnosing expansion valve stuck open vs faulty compressor?

I'm more interested in why the high side drops lower than the static pressure. That should never happen unless you're measuring wrong (couplers not fully engaged, manifold wheels opened instead of closed when measuring pressures), or there's a restriction between the compressor and the high port.
by mk378
Thu Sep 08, 2016 5:20 pm
Forum: Automotive Air Conditioning Forum
Topic: Head seems low on 98 GMC
Replies: 6
Views: 1223

Re: Head seems low on 98 GMC

You don't have to remove serpentine belt, just turn the clutch plate by hand. When there is a blown suction reed, that cylinder would not pump, but the discharge reed will still be there to keep refrigerant from flowing backwards through it. You'll end up with a compressor that still sort of works, ...
by mk378
Thu Sep 08, 2016 4:47 pm
Forum: Automotive Air Conditioning Forum
Topic: Diagnosing expansion valve stuck open vs faulty compressor?
Replies: 12
Views: 3753

Re: Diagnosing expansion valve stuck open vs faulty compressor?

...If the machine and operator can be trusted to put in the right amount of refrigerant. Ordinarily, seeing pressures like 90 / 15 the first thought would be "badly undercharged." Seems really weird that the high side goes up when cut off. I wonder if anything was measured properly. You ma...

Go to advanced search