CAR Radiator Fan Switch

Fan switch sensor: common defects and their signs

  1. Terminals oxidation.
    • The fan doesn’t switch on when the cooling liquid reaches the critical temperature.
    • The engine overheats.
    • The fan turns on earlier than cooling liquid temperature reaches a critical point.
  2. Body deformation.
    • The fan is running constantly, regardless of cooling liquid temperature.
    • Antifreeze boiling occurs.
    • The fan turns on but runs erratically.

How to replace fan switch sensor?

Specialists recommend to check the car fan switch sensor every 25,000 kilometers of mileage. The part can not be repaired, and should be immediately replaced at appearance of defect signs. Buying a component for a car, make sure that the response temperature of new fan switch sensor is equal to the same parameter of the broken down component.

The procedure for part replacement depends on its mounting location. If the sensor is mounted in the cooling liquid connecting pipe, it can be replaced on your own. Before starting works, study technical documentation, as the replacement algorithm may vary for different car models. Basically, the replacement algorithm is as follows:

  1. After the engine cools down, disconnect the wire from the negative terminal of the battery.
  2. Disconnect terminals from the fan switch sensor and remove it.
  3. Treat a new component thread with a thin layer of sealing compound, or cover it with teflon ribbon, in order to prevent cooling liquid leakage.
  4. Install a new gasket under a new sensor and screw the latter, avoiding excessive tightening.
  5. Reassemble in the reversed order.

If the fan switch sensor is mounted in the radiator or on the cylinder head, near the thermostat, the replacement process will be more laborious. It is recommended to entrust this procedure to service station specialists.

Radiator Fan Switch Information

Radiator Fan Switch: Bestsellers

-20%
ERA Temperature Switch, radiator fan
Article № : 330273
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£ 4,27
£ 3,42
incl. 20% VAT, Shipping
  • Number of connectors: 2

OEM-Number

77 28 0 57

59 92 7 46

50 03 4 964 3

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-20%
TOPRAN Temperature Switch, radiator fan
Article № : 103 337
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£ 10,14
£ 8,11
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  • Connector Shape: angular
  • Number of Poles: 3
  • Switch-on point [°C]: 87, 93

OEM-Number

25 19 5 948 1K

25 19 5 948 1G

25 19 5 948 1H

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TOPRAN Temperature Switch, radiator fan
Article № : 109 772
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£ 7,81
£ 6,25
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  • Connector Shape: triangular
  • Number of Poles: 3
  • Switch-on point [°C]: 95, 102

OEM-Number

1J 09 5 948 1A

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METZGER Temperature Switch, radiator fan
Article № : 0915005
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£ 9,56
£ 7,65
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  • Switch point from [°C]: 93
  • Switch point to [°C]: 88
  • Number of Poles: 2

OEM-Number

37 76 0 P00 003

37 76 0 P00 004

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VEMO Relay, radiator fan castor
Article № : V15-71-0035
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£ 39,32
£ 31,46
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  • Voltage [V]: 12
  • Rated Current [A]: 60
  • Number of connectors: 10

OEM-Number

1J 09 1 950 6M

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TOPRAN Temperature Switch, radiator fan
Article № : 104 263
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£ 6,06
£ 4,85
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  • Connector Shape: Rectangular
  • Number of Poles: 2
  • Switch-on point [°C]: 95

OEM-Number

86 79 5 948 1

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METZGER Control Unit, electric fan (engine cooling)
Article № : 0917051
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£ 8,88
£ 7,10
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  • Resistance [Ohm]: 0,54
  • Colour: Grey
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-20%
CALORSTAT by Vernet Temperature Switch, radiator fan
Article № : TS1151
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£ 3,85
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  • Shut-off Point [°C]: 82
  • Thread Size: M22x1.5
  • Technical Information Number: Circuit N.O.

OEM-Number

77 00 7 594 41

13 08 8 4

82 39 5 948 1

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