TM 9-2320-386-10 3-15 MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Table 3-1. Troubleshooting (Contd). SPECIAL PURPOSE KITS: ARCTIC WINTERIZATION KIT 32. ENGINE FAILS TO REACH OPERATING TEMPERATURE Check to see if radiator cover aperture flap is open (para. 2-43). Roll flap down closed if open. 33. ENGINE TEMPERATURE EXCEEDS 230°F (110°C) Check to see if radiator cover aperture flap is closed (para. 2-43). Roll flap open and secure if closed. 34. FUEL BURNING PERSONNEL HEATER FAILS TO START WHEN RUN-OFF- START SWITCH IS HELD IN START POSITION WARNING • Exhaust gases can kill. Do not operate engine coolant heater in closed area occupied by personnel. Doing so may result in injury to personnel. • Do not perform fuel system checks or services while smoking or near fire, flames, or sparks. Always keep a fire extinguisher nearby. Fuel may ignite causing injury to personnel. NOTE If RUN-OFF-START switch is turned to RUN posi- tion before red indicator light illuminates, heater will not operate. Step 1. Press PRESS-TO-TEST button on heater control box to check opera- tion of circuit. If red indicator light does not illuminate, notify unit maintenance. Step 2. Check to see if HI-LO switch on heater control box is set to HI. Set HI-LO switch to HI. Step 3. Check fuel level on fuel gauge. Fill fuel tank if necessary (para. 1-16). Step 4. Check to see if personnel heater shutoff cock is closed. Refer to (para. 2-4). Open personnel heater shutoff cock. END OF TESTING!