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Radiator fan switch for automobile

Original Radiator fan switch catalogue

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.

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Control Unit, electric fan (engine cooling) RIDEX 3545C0006
Car Radiator fan switch 3545C0006
Article №: 3545C0006
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£ 46,49
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  • Number of pins: 2
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Temperature Switch, radiator fan TOPRAN 720 170
Car Coolant fan switch 720 170
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  • Thread Size: M 22 x 1,5
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Temperature Switch, radiator fan FAE 36050
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  • Switch point from [°C]: 87
  • Switch point to [°C]: 82
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Temperature Switch, radiator fan VEMO V15-99-1956-1
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Article №: V15-99-1956-1
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£ 10,99
incl. 20% VAT, excl. delivery costs
  • Thread Size: M22x1,5
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  • Supplementary Article/Supplementary Info: with seal
  • Number of pins: 2
  • Colour Coding: White
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  • Weight [kg]: 0,057
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Temperature Switch, radiator fan CALORSTAT by Vernet TS6994
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Control Unit, electric fan (engine cooling) VEMO V25-79-0009
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Temperature Switch, radiator fan FAE 37580
Car Radiator fan switch 37580
Article №: 37580
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Control Unit, electric fan (engine cooling) STARK SKCUE-4520005
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Article №: SKCUE-4520005
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Temperature Switch, radiator fan MEYLE 100 959 0003
Car Radiator fan temperature switch 100 959 0003
Article №: 100 959 0003
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£ 10,99
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  • Operating voltage [V]: 12
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  • Switch point to [°C]: 102, 95
  • Spanner Size: 29
  • Supplementary Article/Info 2: with seal ring
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Relay, radiator fan castor VIKA 99510019401
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Relay, radiator fan castor VIKA 99190019901
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£ 16,99
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Temperature Switch, radiator fan CALORSTAT by Vernet TS1292
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