I got the compressor to kick in by overiding the pressure switch on the receiver/dryer. The pressure on low side only got up to 70 psi and high was less than 50 psi. This was with adding 2 cans of refrigerant w dye! I checked for leaks with a black light on the compressor/condenser and inside the car around the vents, but didn't see anything! Any thoughts on my next steps? Does the low pressure on the high side indicate a big compressor leak?