TM 9-2320-209-10-1 4-17. OPERATION OF ARCTIC WINTERIZATION KIT. a. General. The arctic winterization kit is designed for use in areas where the average temperature is -25 °F to -65 ºF. b. Operating the Winterfront Cover. NOTE Installation of quilted cargo compartment cover and quilted engine compartment cover is done at direct support maintenance level. 1. 2. 3. 4. During cold weather when engine cannot hold normal operating temperatures, attach a winterfront cover (1) to radiator brushguard. Open aperture flap (2) when engine temperature goes above 180 °F. CAUTION If engine temperature continues to rise after opening aperture flap (2), take off winterfront cover (1) com- pletely so that engine does not overheat. Failure to remove the winterfront cover may cause damage to the engine. Close aperture flap (2) when engine operating temperature stays below 180 °F. Close aperture flap (2) during standby periods and overnight. 4-384