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Brass threaded sensor switch, copper finish, 3/8 NPT, 5.5 by 1.9 cm

Unique-Bargains

Unique-Bargains Cooling Fan Temperature Sensor Switch 3/8" NPT 170° On 155° Off

SKU CH-9D5P-1MAGB

Activates an electric cooling fan at 170 °F and shuts it off at 155 °F, fitting 3/8" NPT ports on engine blocks, radiators or manifolds

  • Activates fan at 170 °F to prevent overheating
  • Deactivates at 155 °F to save power and reduce wear
  • 3/8" NPT thread fits most engine blocks and radiators
  • Metal body resists corrosion for long service life
  • Compact 2.17" length installs in tight water outlets

Universal fit for electric cooling fans

This electric cooling fan temperature sensor switch activates the fan at 170 degrees and deactivates it at 155 degrees. It measures the temperature of liquids such as water, motor oil and coolant. The unit fits most engine blocks, radiators, manifolds or water outlets.

Thread size and temperature thresholds

The switch features a 3/8" NPT thread for direct installation into compatible ports. Its fixed on and off temperatures of 170 and 155 degrees Fahrenheit control fan operation without adjustable settings. The metal construction provides durability for long service life in automotive cooling systems.

Verify port compatibility before ordering

Confirm that your application uses a 3/8" NPT port, as the sensor will not fit other thread sizes. Check that the 170 degree on and 155 degree off thresholds match your engine cooling requirements. The overall length of 3.18cm from the top of the threads to the tip must clear surrounding components.

How it compares

Measured against everything we stock in Cooling System & Pump Tools, at today’s prices. Recalculated every night.

Price $10.99
Cheaper than about 99% of the 11 comparable items (median $35.99).

Specifications

Product
Brand nameUnique Bargains

Questions about this item

Will the 3/8" NPT threads need re-taping or replacement after repeated heat cycles?

The sensor is made of durable metal for long service life; standard practice is to inspect the thread sealant whenever the cooling system is drained and re-apply if the tape shows hardening or leaks.

What is the first limit reached when the engine runs continuously at high load?

The switch activates the fan at 170 degrees and shuts it off at 155 degrees, so the 15-degree differential is the control limit that cycles first under sustained heat.

Does the sensor itself add noticeable heat or electrical draw during all-day operation?

The unit is a passive thermal switch with no active electronics, so it contributes no measurable heat and draws negligible current beyond the fan relay it controls.

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