ENGINE AR-PRIMARY 3911907 - Caterpillar

At operating temperature, the engine coolant is hot and under pressure. Steam can cause personal injury. Drain the coolant only after the engine has been stopped and the fill cap is cool enough to touch with your bare hand. Remove the fill cap from the radiator slowly to relieve pressure. Cooling system conditioner contains alkali. Avoid contact with the skin and eyes to avoid personal injury.
1. Remove left hand door assemblies (1) and (2) from the engine enclosure. 2. Remove bolt (3), the washer, and left hand door assembly (4) from the engine enclosure.
Bottom of engine enclosure tube