A/C compressor makes noise
Ok, puled the EPR valve - pics attached. I have heard that they make an adjustable valve. Don't think this one is adjustable. At any rate, these valves are set from the factory at 26 psi for R12 operation. If I change over to R134A, the pressure should be lowered to 22psi.??? If the compressor was bad I would think the noise would be prevalent at all rpm's. BTW, this same noise occurred with the original compressor.
