Thermo King T-1000R, Maintenance Manual

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Engine Maintenance 9-5
ENGINE COOLING SYSTEM
General Description
The engine employs a closed, circulating type, pressurized cooling system. Correct engine temperatures are controlled and
maintained by a radiator, fan and thermostat. The coolant is circulated through the system by a belT-driven centrifugal pump.
The pump draws the coolant from the side of the radiator (large header), circulates it through the cylinder block and head, then
back to the radiator. A thermostat mounted in the water outlet from the cylinder head to the radiator automatically maintains
coolant temperature within the specified temperature range.
All water-cooled engines are shipped from the factory with a mixture of 50 percent permanent type antifreeze concentrate and
50 percent water in the engine cooling system.
This provides the following:
1. Prevents freezing down to -30 F (-34 C).
2. Retards rust and mineral scale that can cause engine overheating.
3. Retards corrosion (acid) that can attack accumulator tanks, water tubes, radiators and core plugs.
4. Provides lubrication for the water pump seal.
1. Engine 6. Radiator
2. Overflow Cap 7. Petcock (Bleed Tap)
3. Expansion Tank Cap 8. Drain Tubing
4. Expansion Tank 9. Drain Cock
5. Coolant Level Sensor
T-Series Engine Cooling System Components TK 376U
1
2
4
6
3
5
8
9
7