I went to help a friend today with a 2.5 ton Heir condenser. He tried to charge it, but had problems. I put my guages on it,turned it on and the High side spiked to 500 psi! It dropped alittle but still stayed above 350 psi while running. The suction side was 120 psi. I shut it down quickly. I have never seen pressures this high on a R22 system, not sure what could cause this. The compressor was also making sort of a "whining" sound..Any suggestions,remedies, would be great.