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Electric Fan Sensor, 1/2 NPT

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Specs
Material Type:
Brass
Overall Length:
2.75
Sold in Quantity:
Each
Under Head Length:
1.50
Thread Pitch:
1/2"NPT
Temp. Range:
Closed between 184 deg. to 216 deg. F
Electric Fan Sensor, 1/2 NPT
Electric Fan Sensor, 1/2 NPT

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Electric Fan Sensor, 1/2 NPT

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What's in the Box

This trick electric fan switch is a normally open temperature switch with 1/2" NPT male threads that screws into your intake manifolds water passage. When the coolant reaches 185°-215°, the contacts on the cooling fan switch close, activating a relay which directs current to your electric fan. When the engine cools, the contacts on the fan relay switch open, and the fan stops automatically. This radiator fan switch arrangement is not adjustable, but is more rugged than other temperature fan switch setups.

NOTE: This thermal fan switch must be used with a fan relay. If installed as a gounding fan switch, it will burn out. We suggest using this temperature fan switch with our relay 910-64044. Make sure the fan switch is mounted in the manifold or radiator tank so that the bulb is submerged in the HOT engine coolant.

910-64013 Instructions (PDF)

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SPAL Cooling Fan Sensors, 3/8 NPT
                        

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

 

Electric Fan Sensor, 3/8 NPT
                        

This trick electric fan switch is a normally open temperature switch with 3/8" NPT male threads that screws into your intake manifolds water passage. When the coolant reaches 185°-215°, the contacts on the cooling fan switch close, activating a relay which directs current to your electric fan. When the engine cools, the contacts on the fan relay switch open, and the fan stops automatically. This radiator fan switch arrangement is not adjustable, but is more rugged than other temperature fan switch setups.

NOTE: This thermal fan switch must be used with a fan relay. If installed as a gounding fan switch, it will burn out. We suggest using this temperature fan switch with our relay 910-64044. Make sure the fan switch is mounted in the manifold or radiator tank so that the bulb is submerged in the HOT engine coolant.

910-64019 Instructions (PDF)

Cooling Fan Control for Mechanical Gauges
                        

Easy to install and adjust! This is the slickest thing we've seen in years. This adjustable box simply uses your mechaical temperature gauge as the sending unit to control your cooling fan. Includes a temperature sender (1/8" NPT fitting) which installs into your engine's water jacket. Installation is as simple as hooking up seven wires and then turning a knob on the end of the box to set the on and off temperatures for the fan.

Features a built-in 30 amp relay to provide maximum power to your fan and it comes with a tiny LED lamp to let you know when the fan is running plus a fuselink to protect the wiring between the temperature control unit and the fan.

  • No radiator tube
  • Uses existing wiring
  • Simple hookup
  • Fully adjustable
  • Driver-controlled temperature
  • A/C compressor switch to automatically turn on fans
  • 30 amp relay inside box
  • Protective fuse link
  • For 12 volt electrical systems
  • Measures 4-3/4" x 3" x 1-1/4"

 

ARP Fasteners 100-9904 Thread Sealer
                        
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  • Sealant range: 10,000 psi (pressure)
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Learn why using thread sealant is so important in our tech article, Installing New Hardware.

Budget 40-Amp Relay Kit
                        

Use this handy 40 amp relay to wire up your 12 volt horn, electric fuel pump, electric fan with sensor, shaved door handles, or whatever! Contains relay, plug, wire, and instructions.

The wiring would be as follows (included in kit instructions):

  • Red Wire #30 Prong = main 12V power source
  • Black Wire #85 Prong = Electric fan sensor OR low (oil) pressure switch OR grounding switch
  • Blue Wire #86 Prong = 12V toggle switch OR ignition switch "ACC" terminal
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Fan or Fuel Pump Relay Installation Instructions (PDF)

Universal Relay for Fan/Horn
                        

This heavy duty relay takes the heavy-amp load off the switch, thus preventing an overheated circuit and a possible wiring harness fire. Works well with electric fans and horn circuits too. 30 amp relay.

The wiring for the relay is as follows:

  • Short Red Wire (from relay post 87) = power lead to horn or fan
  • Long Red Wire (from relay post 30) = main power supply in
  • Short Black Wire (from relay post 85) = makes ground connection thru a temp sensitive switch or a grounding horn button
  • Long Gray Wire (from relay post 86) = connects to switched 12 volt power (like ignition switch) so horn or fan turns on/off with key

Includes relay, circuit breaker, wire, terminals and instructions.

Universal Fan Relay Installation Instructions (PDF)

Book - The Official Guide to Cooling Systems
                        

Learn the secrets of how a cooling system works so you can solve your own cooling system problems. This book was written by a man who has 20-plus years preparing pre-1948 cars for the 4,000-mile Great Race across the United States. Great info for all, but geared toward the Flathead Ford V8.

By Randy Rundle. 8.5" x 11", 36 pages.