TM 9-2320-386-10 2-98 2-43. OPERATION OF ARCTIC WINTERIZATION KIT (Contd) e. Operation of Radiator Cover. (1) General. The radiator cover is used to help engine reach and maintain proper operating temperature and keep snow and ice off radiator and charged air cooler coils. (2) Start engine (para. 2-12 or 2-13) with radiator cover aperture flap (2) closed. (3) Roll up and secure aperture flap (2) when temperature gauge reading exceeds 180°F (82°C). CAUTION Failure to remove the radiator cover when temperature gauge read- ing exceeds 230°F (110°C) may result in overheated engine. (4) Remove radiator cover (1) if temperature gauge exceeds 230°F (110°C). f. Operation of Slave Receptacle. Refer to para. 2-25. g. Thermal Barrier. Adds insulation to vehicle cab so more warm air is retained in arctic conditions. ~ ~ 1 2