794 AC Off-Highway Truck Caterpillar

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Climbing equipment may be required to access this service point. Refer to the Operation and Maintenance Manual, "Mounting and Dismounting" topic for safety information.

Engines That Are Equipped With a Sight Gauge

Illustration 1	g03454008
Coolant level gauge is mounted on the cab side of the hood.

If the engine is equipped with a sight gauge (1), observe the position of the coolant in the sight gauge. At normal operating temperature, the proper coolant level is in the upper half of the sight gauge. If the coolant level is low, add the proper coolant mixture.

Engines That Are Not Equipped With a Sight Gauge

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Pressurized System: Hot coolant can cause serious burns. To open the cooling system filler cap, stop the engine and wait until the cooling system components are cool. Loosen the cooling system pressure cap slowly in order to relieve the pressure.

Check the coolant level when the engine is stopped and cool.

Remove the cooling system filler cap slowly in order to relieve any pressure. Maintain the coolant within 13 mm (0.5 inch) below the bottom of the filler pipe.

Add Coolant

Note: For the proper coolant mixture to use, see this Operation and Maintenance Manual, "Refill Capacities and Recommendations"
(Maintenance Section).

1. Stop the engine. Allow the engine to cool.

2. Remove the cooling system filler cap slowly in order to relieve any pressure. Pour the proper coolant mixture into the filler pipe.
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   Illustration 2	g00103639
   Gaskets

3. Clean the cooling system filler cap. Inspect the gaskets of the cooling system filler cap. If the gaskets are damaged, replace the old cooling system filler cap with a new filler cap. Install the cooling system filler cap.

4. Start the engine. Inspect the cooling system for leaks.