AC not working in cab

Here is the condensed version of the expanded troubleshooting tree.

Issue

AC/Heat unit not working

Cause

The AC unit not working can be caused by multiple problems, follow the procedures in the resolution notes to find out what is wrong with the unit, or if it need replaced

Resolution

1. Check the circuit breakers that control the AC and heat units
   2. Check phase detector inside AC unit to be sure it has 2 lights
   3. Replace AC controller to the left of seat
   4. Check to see if the Condenser fan on the back of the cab runs when AC is selected, if not, check the fuses
   5. Try using the “Defrost” setting and see if the AC turns on
   6. Access AC unit and check to see if all the sensors are connected and working properly
   7. If you cannot figure out why the AC unit is not running, order a new unit and replace it

TA23-450-C – Troubleshooting flow chart for the ultraview cab air conditioning system_EN