Rebuilt my RV2 compressor, and when I done, I hooked it up to a Dewalt drill and spun the compressor. I realized right away that it started to push air out the front the stopped, I checked the rear port and it had no intake. When I removed the EPR valve the compressor seemed to work fine, pulled a good suction on the intake and pushed air out of the front. I am know wondering if the EPR valve is bad. should it be closed at room temp and bench testing? I don't really want to buy one if I have a good one, but Im not really sure how to test it without putting it in the car and charging it.

And I do plan on using R12, thats why I didn't remove it

any help would be appreciated


Thanks

Duane