TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9-2350-311-10 3-5 HULL MAINTENANCE PROCEDURES — CONTINUED 3-5.1 Engine Cooling System — Continued b. Faulty Cooling System NOTE Overheating is caused by a faulty cooling system or low coolant level. Proper maintenance of cooling system will help prevent overheating. If radiator is clogged or dirty, notify unit maintenance. c. Draining Coolant 1 2 3 4 5 6 7 8 Allow engine to cool down below 185° F. Place vehicle on an incline, nose down, to facilitate coolant draining. Remove three cap screws (3), three flat washers (4), and access cover (5) with gasket (6) from bottom of vehicle. Use a container to catch fluids and remove plug (7). Turn coolant drain valve (8) counterclockwise to drain. Slowly remove radiator cap (2). Close coolant drain valve (8), install plug (7), and refill coolant (para 3-5.1a.). Install access cover (5) with gasket (6), three flat washers (4) and three cap screws (3). 3-15