Cab Heater

NOTE: When heater is turned on for the first time, or after long periods of non-use, heater may cycle through the start-up diagnostic process more than once until air is purged from fuel line.

1. Turn ignition key switch to RUN position.

2. 
   MXAL45682-UN-09APR13

   
   MXAL45683-UN-09APR13

   Turn heater switch knob (A) to one of four positions.
   • Heater switch positions: When the heater switch is rotated fully counterclockwise, the switch is in the off “0” position. Rotating the switch clockwise turns on the heater/fan in four increments (low, medium, high and boost).
   
   

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3. NOTE: A 25A replaceable fuse (C) under the hood is the fusible link. If heater fails to turn on after following correct procedures, check for blown fuse.

   When the heater is turned on, the green LED (B) in the switch knob will illuminate, and the fan will start at low speed.

4. When the heater is operating, the heater monitors the combustion housing temperature and the heater dial setting, and will modify the fan speed and/or temp setting to maintain the preselected temperature setting.

5. When the heater is turned off, the green LED in the switch knob will go off, but the fan will continue to run for a short period of time to cool down the heater, unless the heater was inactive when shut off.