Checking Cooling System

TS281-UN-15APR13

High-Pressure Fluids

CAUTION: Explosive release of fluids from pressurized cooling system can cause serious burns.

Shut off engine. Only remove filler cap when cool enough to touch with bare hands. Slowly loosen cap to first stop to relieve pressure before removing completely.

IMPORTANT: Air must be expelled from cooling system when system is refilled and before running the engine at normal operating temperatures. Air will escape from the coolant system through an engine coolant vent line (if equipped) when the engine is idled. Allow approximately 30 minutes to ensure all air has escaped the system before returning the engine to normal service. If there is no engine coolant vent line installed on the engine (connected to the coolant surge tank) loosen the temperature sending unit fitting (rear of cylinder head) or a plug in thermostat housing to allow air to escape when filling the system. Retighten fitting or plug when all the air has been expelled.

1. Visually check entire cooling system for leaks. Tighten all clamps securely.

2. Thoroughly inspect all cooling system hoses for hard, flimsy, or cracked condition. Replace hoses if any of the above conditions are found.

3. Inspect the coolant pump for wear or leakage.