If it's a PWM signal it's nothing but a pulsed 12V at some frequency. You should be to tap into that easily and calculate the duty cycle. Actually might be more accurate than having some other device figuring it out for you. I've done that on a 4WD/AWD electric clutch system. What do you think woul...

bohica2xo wrote:VAG scan tool.

Is there a way that doesn't cost as much as a new compressor? I have access to oscilloscopes and soldering equipment at the office. I was hoping I could just hook up some probes somewhere and monitor the signal on a scope?

Don't forget about air gap-- the next time it is blowing hot when it should be cold- look and see if compressor is turning- if not, tap it with a wooden hammer handle- if it snaps into action- you have a wide air gap, and a shim needs removed from in behind the clutch driver This is a clutchless co...

The AC in my 2008 VW Eos (78k) is working intermittently (and not particularly well when it does). I did some testing today and got the following measurements, in this order. (Ambient air ~85 F) 1. Engine OFF: Low side @ 88 PSI, High side @ 110 PSI 2. Engine ON, AC OFF: Low side @ 88 PSI, High side ...