A/C Compressor Clutch Circuit and Fan

A/C Compressor Clutch Circuit and Fan:

A/C Compressor Clutch Circuit

Operation of the A/C clutch is dependent upon the following conditions:

^ Demand signal from EATC control

^ State of pressure switch (refrigerant charge level)

VCRM strategy:

^ A/C head pressure sensor signal

^ PCM input on WAC line

PCM strategy: (A/C clutch will be oft with a ground signal to PCM on WAC line)

^ WOT cutout

^ Electronic ignition failure

^ Engine stall

^ High engine coolant temperature

^ High engine RPM

^ Idle anticipation

^ Engine start-up

^ A/C system rapid cycle prevention timer

^ Low charge

Ambient temperature must be above approximately 100°C (500°F) for the A/C compressor to operate.