Recently purchased a 2015 259D serial FTL04527. The A/C is not working. The compressor clutch will engage if you jump a hot wire to it. Checked the switch in the cab and it it working. I have replaced the high and low pressure switches and the relay. I have done a refrigerant recovery and charged to the correct amount. I am still not getting any power at the compressor. Anybody have a wiring schematic and suggestions?
IIRC, the compressor engagement is power thru the low side switch, typically near the compressor. #6 should have power on one leg. If you jumper the connector, the compressor should engage. The condenser fan should come on when AC is switch ON and blower is at any position but OFF. Does the condenser fan come on?
Low pressure switch does not have any power so jumping makes no difference. There is no condenser fan or any wires to connect to a fan. Does this machine suppose to have a fan?
Must be a typo in the parts book. Where is the condenser on yours? Door or with radiator/ hydro cooler?
Does blower motor work (in cab)? If so, following the 567 wire from blower switch, it goes to AC switch in cab. Is there power on 567-hv13 in and 520-hv12 out at the AC switch in cab?
The condenser is in the door. The blower motor does work and there is power on 567-hv13 in and 520-hv12 out at the AC switch in cab
Thanks to all that helped me on this. With the schematic I was able to trace down the problem in the circuit. There is a thermostat switch under the cab floor that the AC circuit runs through and the connector was not making good connection therefore breaking the circuit . After cleaning it up and getting connection , I had power going to the compressor which resulted in AC compressor clutch engaging and VOILA cold air! Once again , thanks to all for the much appreciated help.