Guys

The 12V jump to the compressor is just that, a quick test to confirm operation of the clutch and that the compressor will spin, regardless of line pressure and system functionality. NEVER run a car more than a few mins. As was mentioned above, this test bypasses everything to prevent damage to the system. Ice forming, over pressure, over heating, compressor damage, etc.

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2005 X5 4.8IS
The Blue ones are always FASTER....

Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green