I'm trying to diagnose a problem with the factory a/c on my 1968 Mustang.
Here's the situation..
The clutch is getting hot because it hits a certain spot on rotation that is sort of like a brake being applied.
I was recharging this system with es12a cause as you know the r12 just isn't to be used along with other problems. During the re-charge the low side stopped showing any pressure, the high side remained unchanged.
I was thinking this might be a compressor problem, but after driving a couple weeks and hooking the gauges up again, I switch the A/C on and I get pressure, but now I notice that the clutch appears to keep "sticking" which is causing it to get really hot. Now with the belt off, engine off and key turned off the clutch spins freely. I turn on the key and turn the a/c on (engine off, just to send the power to the a/c clutch brushes). Now the clutch still spins easy but it has a "catch" like a break being applied. If I hold pressure to spin, it gradually passes by this point to spin freely again and this repeats.
Is it possible that this is from an overcharged system and the "braking" effect is actually the valve trying to squeeze the liquid refrigerant through?
Or is it the clutch going bad or something else?