12
124 Workshop Manual, TSD3450E, Issue 1
2800
Coolant temperature sensor
To test Operation 12-12
Special requirements
Check the accuracy of the coolant temperature sensor (A2) if one of these conditions exist:
The engine runs at a temperature that is too hot, but a normal temperature is indicated. A loss of coolant is
found.
The engine runs at a normal temperature, but a hot temperature is indicated. No loss of coolant is found.
Note: The coolant temperature can be read on the display screen of the electronic service tool.
Warning! On a hot engine release the filler cap carefully as the system will be under pressure.
1 When the engine is cool, release the coolant filler cap to relieve any pressure.
2 Remove one of the two plugs (A1) and install the special thermometer, GE50032. A temperature indicator
of known accuracy can also be used for this test. Tighten again the coolant filler cap.
3 Start the engine and run the engine until the temperature reaches the desired range according to the test
thermometer. If necessary, place a cover over part of the radiator to cause a restriction of the coolant flow. The
reading on the coolant temperature indicator should agree with the test thermometer within the tolerance range
of the coolant temperature indicator.
Caution: If a cover was used over part of the radiator ensure that is removed on completion of the test.
4 If the temperature sensor is renewed, do not attempt to disconnect the leads from the unit. Disconnect the
unit at the connection shown (A3).
Special tools
Description Part number
Thermometer GE50032
Pointer
position
Test
thermometer °C
Test
thermometer °F
1 65 to 77 150 to 170
2 99 to 103 210 to 218
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