Originally Posted by
David T
If it won't hold a vacuum you had no business putting any refrigerant into it. The next step should have been a nitrogen fill to 200 psi and a leak test. Make sure you have the correct size fuse in #10. If it keeps blowing you have a wiring problem or the clutch on your GM compressor draws too much current. Might have to use a relay. If you "pegged", the high side, the high side pressure switch should have shut the compressor off. The low side pressure switch should not have let the compressor run with only 500 G of refrigerant. You have some work to do. For the high side to "peg" with so little refrigerant, something is VERY wrong. Possible blockage on the output of the compressor. Are you sure you only put 500 G in? Sounds like you put a lot more than that in. if you are using R-12 you only put in 2.2 lbs. If you are using -134 you use about 1 3/4 lbs.