Ac Compressor Clutch Schematic
How to manually engage ac compressor clutch when the system is low on antifreeze.
Ac compressor clutch schematic. Compressor clutch receives ground at left front corner of engine compartment 13. This clutch has a power lead that can also serve to power a throttle solenoid raising the engine idle on older vehicles to compensate for the added drain of the compressor. Pcm grounds ac compressor clutch relay control coil which closes relay contacts and sends power to compressor clutch coil. Just adding refrigerant will solve this problem.
Looking at the diagram below as an example this is for a manual a c system from a chevy truck you can see that the black blk wire from the compressor depicted on the left lower portion of the diagram is the ground and runs through a ground distribution cell before grounding to the the frame or engine at g102. This open is probably a break in the wire or the connector pin leading from the relay to the pcm. If pcm sees open at high psi switch it interrupts ground to compressor clutch control coil and operates high speed condenser fan. The automotive compressor is wired to a car s electrical system through the wiring harness connected primarily by an electric clutch.
If your car is compatible with r134a type of refrigerant attaching a can to the system will override the low pressure switch and restore the normal function of the compressor clutch. A c compressor clutch coil test. If there were an intermittent condition where the clutch works one minute and not the next suspect a loose plug or connection at the clutch pcm fuse or the.