Hi All,

The a/c in my 2000 c280 (with digital climate control) has not worked for about three months now (it stopped working after the car was not used at all for two months). Finally I got myself to take some measurements. As the system does not have a high side port, I took the high side measurements from putting the climate control into diagnostic mode. All measurements were taken at a 90F ambient.
Static pressure: 107psi
Pressures at 900rpm: 98psi-low and 114 psi-high
Pressures at 2000rpm: 82psi-low and 131 psi-high

I find these values strange. To me they do not look as if the expansion valve was stuck in or out. Do these compressors have an internal pressure relief valve that tends to get stuck?

Any ideas?

Thanks,

Greg

__________________
1983 560SL Megasquirted (originally 380SL)

My former Mercedes:
1985 300SD ~190k
1990 560SEL
2000 C220 CDI
1983 380SEC 102k dual-chain conversion
2000 C280 70k (sold)
1987 300DT (W124 - sold)
1972 220D (sold)
1971 220D (sold)