Compressor Clutch: Testing and Inspection

COMPRESSOR CLUTCH
The most likely source of problem is clutch slippage. Factors are listed here. Exercise ample care.
1) Clearance between clutch hub and pulley should be within specifications at all peripheral points.

Clearance: mm (in)
HITACHI A/C
0.5 - 0.8 (0.020 - 0.031)
PANASONIC A/C
0.4 - 0.6 (0.016 - 0.024)

2) Make sure that there is no oil or dirt on friction surfaces of clutch disc (clutch hub) and pulley. Remove any oil or dirt with a dry rag.
3) Make sure that terminal voltage at magnetic coil is above 10.5 V.

Compressor Clutch Testing (Hitachi):

Hitachi

Compressor Clutch Testing (Panasonic, Part 1):

Compressor Clutch Testing (Panasonic, Part 2):

Panasonic