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SPAL Cooling Fan Sensors, 3/8 NPT
SPAL Cooling Fan Sensors, 3/8 NPT

SPAL Cooling Fan Sensors, 3/8 NPT

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31 Reviews | 9 Answered Questions
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SPAL Cooling Fan Sensors, 3/8 NPT
SPAL Cooling Fan Sensors, 3/8 NPT
SPAL Cooling Fan Sensors, 3/8 NPT
SPAL Cooling Fan Sensors, 3/8 NPT
SPAL Cooling Fan Sensors, 3/8 NPT
SPAL Cooling Fan Sensors, 3/8 NPT
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Part # 91064026
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Thread Pitch:
3/8" NPT
Material Type:
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Operating Temperature:
185 °F


The SPAL cooling fan switch features 3/8" NPT threads on a stainless steel, hermetically-sealed body. Thermal fan switch threads into your intake manifold or cylinder head and activates a relay (not included, sold seperately) when the bulb is immersed in coolant that is 185° F or 195° F, depending on which electric fan switch you use. As the engine cools, the contacts on the fan relay switch open, and the fan stops automatically.

Make sure the electric fan switch bulb is submerged in the HOT engine coolant.

  • Non-adjustable radiator fan sensor 
  • Operating Switch Range: 35° F to 480° F
  • Max Current & Voltage: 3 amp, 32 VDC
  • Grounded case only



Thread sealants such as ARP # 101-1009904 or a Permatex type high temp thread sealant are recommended for use with these sensors. Apply thread sealant to the threads in a very minimal quantity so as to not coat all of the threads as the unit must still maintain the ground through the threads.  Teflon tape can sometimes interfere with the proper ground through the threads as required.

Important Messages:

  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
Some parts are not legal for use in California or other states with similar laws/regulations

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  • What is the purpose of a fan shroud? Do you even need a fan shroud? Learn why you need a fan shroud to keep your engine cool and at peak performance!
  • Learn how to wire dual electric radiator fans. Use our dual fan wiring diagram and guide to make sure you properly wire your fans to your thermostat.
  • When it comes to demolition derby racing, radiators are a key component to be the last car running. Follow Jeremy's guide on the large variety of Demolition Derby radiators available at Speedway Motors.

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