Table 1. Preventive Maintenance Checks and
Services (PMCS) for M915A3 - Continued.
Not Fully Mission
DO NOT remove radiator cap unless engine is
cold. Remove cap in two steps. First, place a thick
cloth over cap and slowly turn cap left to first stop.
Pause and allow pressure to escape. Turn cap fur-
ther left until it can be removed. This is a pressur-
ized cooling system and escaping steam, hot
water, or coolant will cause serious burns.
Remove radiator cap (52) and
check coolant level in radiator
(53). Coolant must be within 2½
in. (6.4 cm) below filler neck.
Add coolant as required (WP
Vehicle operation with inoperative horn may vio-
late AR 385-55.
If tactical situation permits, check
operation of electrical and air
Verify that windshield wipers and
heater/ventilator or air condi-