M1152A1 A/C Compressor Clutch not engaging.

[ItWasntMe00]

(SOLVED) I disconnected wires 438A and 435D from the switch and bypassed it, the compressor now engages and runs cold.

Things I have done to try and fix this issue are using the RobinAir to recover, vacuum and recharge the system with the amount labeled on the air filter housing (2 man 1lb 7oz or .65kg). I have check for continuity on the A/C and heat switch (functions). Also i have tried to replace the thermotion electric valve. Also checked for continuity on the A/C Compressor itself. Checked the spacing from the Clutch and pully for clearance per tm.

Next steps I wanna take are checking the A/C relay by the condenser in the rear of the truck.

If anyone has ran into this issue and have any insight it much appreciated! Thank you!

 

[ItWasntMe00]

Things I have done to try and fix this issue are using the RobinAir to recover, vacuum and recharge the system with the amount labeled on the air filter housing (2 man 1lb 7oz or .65kg). I have check for continuity on the A/C and heat switch (functions). Also i have tried to replace the thermotion electric valve. Also checked for continuity on the A/C Compressor itself. Checked the spacing from the Clutch and pully for clearance per tm.

Next steps I wanna take are checking the A/C relay by the condenser in the rear of the truck.

If anyone has ran into this issue and have any insight it much appreciated! Thank you!

 

[DREDnot]

first thing to try is to bypass the temperature switch on the side of the front evaporator unit. just connect the two (438A and 435D) and see if it fires up

 

[KKroger]

Apply 24VDC to the clutch coil and see if it clicks in. if not it could be a bad clutch.
Check the High/Low pressure switches. Check the Temp Switch... all of these are bypassable.