90 GL  Compressor clutch does not engage.  After a recent gunk ande wash
engine compartment clutch will not engage.

Clutch is good, engages with a jump wire.  Fuses at left on d pillar are
good as well as all in fuse box.  Bentley shows a high and a low
pressure switch but mine seems to be combined in one unit with 4 wires.

Any suggestions.

TIA

Harry Patrick

57 Porsche Speedster
80 Benz 240D
84 Westy
90 Vanagon
01 Volvo V70 2.4 turbo Wagon (wife's)