I have 2002 Honda cr-v. my car A/C is not working good. A/C clutch engaging and disengaging problem. When a/c clutch engage that time Freon pressure is 30 PSI at Low side and when a/c clutch disengage at that time Freon pressure is 100 psi at Low side. On compressor has high pressure relief valve. Sometime high pressure relief valve open and Freon is coming out from high pressure valve. I have HS-110R Keihin compressor on my cr-v. high pressure valve p/n : 38801-PCA-006 ( Valve sub. Assembly…..from Honda dealer )

My questions :

1. Why a/c clutch engaging and disengaging on my cr-v ?

2. do I need to change high pressure valve ?
3. why high pressure valve open ?