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Radiator fan switch for automobile

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Information - Radiator fan temperature switch
Fan switch sensor: replacement and selection
When and why a fan switch sensor needs replacement
The fan switch sensor has no specified lifetime limit. Most often replacement is performed after contacts oxidation.
Ingress of water in the engine compartment can be the cause of sensor defects. Influence of moisture affects contacts condition negatively.
Part defects can be indicated by unprompted activation of the fan when the ignition is turned on. Moreover, the fan stops switching on if the sensor is broken. Due to this temperature of the cooling liquid increases leading to engine overheating. Readings of a corresponding dashboard indicator show this.
It is recommended to visit a service station for part replacement. Cooling liquid should be drained before demounting of the radiator fan switch. In order to do this safely, you need a special coolant exchanger machine. Also, wires which supply electric current to the part need be to disconnected before servicing. A seal, which is often sold in a kit should be installed together with the sensor.
How to select a fan switch sensor
According to operation principle sensors are divided into three main types. A reservoir filled with wax is a basic element of the first type. It expands when heated and moves a pusher, which in turn activates the fan. The working element of devices of the second type is a bimetallic plate. It changes its shape when heated, which leads to closing a contact and, as a result, to activation of the fan. Electronic devices with a thermistor belong to the third type. Their operating principle is based on changes in thermistor electric resistance caused by changes in temperature. This is monitored by an electronic control module, which sends corresponding signals to the fan, turning it on or off.
Fan switch sensors for various car brands are produced by such manufacturers as Metzger, Vemo, Meyle, Facet. A required unit is selected in accordance with the car brand, model, production year as well as engine specifications and type of the fan installed. Pay attention that a certain temperature of sensor activation is specified for each car.
Size and pitch of the thread, quantity of connectors are important for proper installation of the part. Moreover, sensors can vary by mounting location. Often the part is mounted on the cylinder block, however, in some cars it is fastened in the lower part of a radiator.
Best goods: Radiator fan switch

- Shut-off Point [°C]: 82
- Thread Size: M22x1.5
- Condition: New

- Shut-off Point [°C]: 82
- Thread Size: M22x1.5
- Number of pins: 2
- Condition: New

- External Thread [mm]: M22 x 1,5
- Number of connectors: 3
- Supplementary Article / Supplementary Info Info 2: with seal ring
- Temperature range from [°C]: 87
- Condition: New

- Connector Shape: rectangular
- Thread Size: M 22
- Number of pins: 2
- Switch-on point [°C]: 97
- Shut-off Point [°C]: 92
- Thread Pitch [mm]: 1,5
- Supplementary Article / Supplementary Info: with gasket/seal
- Condition: New

- Connector Shape: angular
- Number of pins: 3
- Switch-on point [°C]: 85, 93
- Shut-off Point [°C]: 80, 88
- Number of switch stages: 2
- Thread Size: M 22 x 1,5
- Condition: New

- Spanner Size: 29
- Number of connectors: 3
- Colour Coding: black
- Temperature range from [°C]: 95, 102
- Temperature range to [°C]: 84, 92
- Connector Shape: rectangular
- Weight [kg]: 0,048
- Supplementary Article / Supplementary Info Info 2: with seal ring
- External Thread Size: M22 x 1,5
- Condition: New

- Spanner Size: 29
- Number of connectors: 3
- Colour Coding: grey
- Temperature range from [°C]: 95, 102
- Temperature range to [°C]: 84, 92
- Weight [kg]: 0,061
- Supplementary Article / Supplementary Info Info 2: with seal ring
- External Thread Size: M22 x 1,5
- Condition: New

- Number of connectors: 2
- Colour Coding: white
- Switch Point [°C]: 90, 95
- Weight [kg]: 0,045
- for OE number: 61 31 1 364 272
- External Thread Size: M14 x 1,5
- Condition: New

- Thread Size: M22x1.5
- Supplementary Article / Supplementary Info Info 2: with cable
- Sensor Type: Open-style sensor
- Operating temperature from [°C]: 88, 92
- Operating temperature to [°C]: 83, 87
- Condition: New
- Thread Size: M22 x 1,5
- Spanner Size: 29
- Number of pins: 2
- Switch point from [°C]: 92
- Switch point to [°C]: 87
- Condition: New

- Thread Size: M22x1.5
- Sensor Type: Open-style sensor
- Operating temperature from [°C]: 93, 97
- Operating temperature to [°C]: 88, 92
- Condition: New

- Voltage [V]: 12
- Relay function: Terminal 30, Clamp 87
- Rated current [A]: 40
- Weight [kg]: 0,03
- Product line: Original Quality
- Fitting Position: Engine Compartment
- Packaging height [cm]: 4,2
- Packaging Depth [cm]: 2,8
- Condition: New