Coolant Temperature Sensor/Switch (For Computer): Description and Operation

GF07.04-P-6040P Coolant Temperature Sensor, Component Description
ENGINE 642 in MODEL 164.1 /8, 203.0 /2, 221.0 /1, 251.0 /1 up to Model Year 2008 /AEJ 07
ENGINE 642 in MODEL 209.3 /4, 211.0 /2 /6, 219.3
ENGINE 642 in MODEL 461.3, 463.3 up to 31.5.12





Shown except code (494) USA version and except model 461.3

B11/4 Coolant temperature sensor

Location
The coolant temperature sensor is located on the left of the cylinder head under the rail.

Task
The coolant temperature sensor detects the coolant temperature and sends this value to the CDI control unit (N3/9).

Design
The coolant temperature sensor possesses an integral measuring resistor with a negative temperature coefficient (NTC).

Function
The NTC measuring resistor alters its electrical resistance in line with the coolant temperature. Electrical resistance decreases as temperature increases.