So my compressor check valve went out yesterday. Pulled vacuum on the system today and no good. I swear I've seen this valve on newer mitsubishi compressors. The diaphragm inside ruptured. I'm wondering if anyone has sourced these valves from somewhere else? Mopar can't look up a 91 truck a/c system because it was in an accessory manual hence it's not in their files. Also i think the valves were different on the R134 trucks compressors so I can't look it up through mitsubishi's parts catalog either.