Fan temperature switch, 2 pin. Porsche 924 / 944 / 928 / 928S / 928S2  ›  823959481F

Fan temperature switch by OE Match. This version has a 2-pin electrical connection and controls cooling fan operation according to coolant temperature.

Fits

• Porsche 924 1976-85
• Porsche 944 1982-85
• Porsche 928 1978-86
  
  

Check fitment for your specific vehicle (model, year, engine) before ordering.

Diagram ref: 5

What This Product Does

The switch responds to coolant heat by changing the electrical state of the fan control circuit. This allows the cooling fan to operate when required, particularly while the vehicle is stationary or moving slowly and natural airflow through the radiator is limited.

Functions

• Provides temperature-dependent switching for the electric cooling fan.
• Controls fan activation as coolant temperature rises.
• Allows the fan circuit to change state as the coolant cools.
  
  

Technical Details

• Part reference: 823959481F.
• Brand: OE Match.
• Electrical connection: 2 pin.
  
  

Symptoms of Fault

• The fan remains inactive despite rising coolant temperature.
• Fan operation continues without the expected temperature-related shut-off.
• Coolant temperature increases during slow-moving traffic or while stationary.
• The fan starts inconsistently or activates later than expected.

These symptoms do not confirm switch failure on their own. Fan motors, relays, fuses, damaged wiring and poor terminal contact can produce similar behaviour.

Why Replacement Matters

A confirmed switch fault can interrupt temperature-dependent fan control. Replacing the defective component addresses the switching fault rather than leaving the fan permanently inactive or operating continuously. Check the surrounding electrical connections and cooling system at the same time, as a replacement switch will not resolve a separate motor, relay or coolant circulation problem.

FAQs

• Does an inactive fan always mean the switch has failed?
  No. Diagnose the motor, electrical supply, fuse, relay and wiring before deciding which component needs replacement.
• Why might the temperature rise mainly in traffic?
  With less airflow from vehicle movement, radiator cooling depends more heavily on the electric fan.
• Can trapped air affect diagnosis?
  Yes. Air pockets can cause uneven coolant temperatures, so correct filling and bleeding are important when investigating cooling faults.
• What should be checked before fitting?
  Compare the original reference, connector and vehicle application. Follow the model-specific installation procedure and check for leaks and correct fan operation afterwards.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

823959481F

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