the front plate has shims to set the air gap.
remove to reset it about 0.5mm+
then test to see if it drags when hot.
problems:
compressor gets old the imput shaft can be pulled in reducing the gap when low pressure is pressent in the suction side of compressor-[cold].so it drags.afte adjusting run withot the cover to test.
Low voltage-i think some have a water overheat relay-most at sometime get an extra relay fitted with direct fused power.some had pressure switch isues-no reason full power must go through these switches.
the thermol overload in the rear dies-it a mechanical switch to brake the circuit when the compressor overheats.
if the clutch has been slipping often the coil needs extra current [evidence of a short].
clutch is common with another car-compressor is not common.replacment compressors are often not the same.
P/s often have to take the high spots of the surface to stop it slipping.the pulley/disc have recessed cooling slots and the high spots cut into the slots breaking the pulley.
