Replacement American Volt Electric Radiator Fan Thermostat - 12 Month Warranty - Temperature Switch with Thread-In Brass Probe (1/8" NPT, 180'F On - 165'F Off)

Take control of electric radiator fan operation with the Wholesale Sensors Replacement for American Volt Electric Radiator Fan Thermostat Temperature Switch with Thread-In Brass Probe. Designed as a perfect OEM-style replacement, this temperature-sensitive switch is engineered to meet or exceed original functional specifications while providing automatic electric cooling fan control for compatible automotive and custom cooling systems.

The switch is configured to activate the cooling fan circuit at approximately 180°F and switch it off once coolant temperature drops to approximately 165°F. This automatic ON/OFF operation helps the electric radiator fan run when additional cooling is required without requiring the driver to manually operate a fan switch.

With its 1/8″ NPT thread-in brass probe, the thermostat installs directly into a compatible coolant passage or temperature-sensing port. This allows the temperature-sensitive portion of the switch to respond directly to coolant temperature.

180°F ON and 165°F OFF Temperature Control

The temperature switch is designed around two operating points:

Fan ON Temperature: Approximately 180°F
Fan OFF Temperature: Approximately 165°F

As coolant temperature reaches approximately 180°F, the temperature switch changes state to activate a properly configured electric fan control circuit. Once coolant temperature decreases to approximately 165°F, the switch changes state again and allows the fan to shut off.

The approximately 15°F difference between the ON and OFF temperatures helps prevent the cooling fan from rapidly cycling on and off around a single temperature point.

Actual system behavior can be influenced by sensor mounting location, coolant circulation, thermostat temperature, radiator efficiency, ambient temperature, fan capacity, and other cooling-system conditions.

1/8″ NPT Thread-In Brass Probe

The temperature switch features a 1/8″ NPT threaded brass probe designed for installation in a compatible coolant port.

Threaded installation provides direct temperature sensing and makes the switch useful for custom automotive cooling systems where a suitable 1/8″ NPT port is available.

Before ordering, verify that the intended installation location uses the correct 1/8″ NPT thread size. NPT is a tapered pipe thread and should not be confused with similarly sized straight or metric threads.

Adapters may be used in some custom applications, but the adapter and mounting location must be appropriate for the cooling system and allow the sensing portion of the switch to accurately respond to coolant temperature.

Universal Automotive Cooling Applications

Unlike a vehicle-specific factory coolant temperature sensor, this electric radiator fan thermostat is a universal-style cooling system component.

It can be used in compatible:

Cars and trucks
Classic vehicles
Muscle cars
Hot rods and street rods
Engine swap projects
Performance vehicles
Race and track vehicles
Custom radiator installations
Aftermarket electric fan conversions

Compatibility is determined by the cooling system configuration, required switching temperatures, electrical circuit, and 1/8″ NPT mounting requirement, rather than a specific make, model, or year.

Always confirm that a 180°F ON and 165°F OFF operating range is appropriate for the engine and cooling system before installation.

Automatic Electric Radiator Fan Operation

Electric radiator fans help move air through the radiator when natural airflow is insufficient to maintain proper coolant temperature.

This is particularly important when a vehicle is idling, driving slowly, operating in traffic, or using a cooling system where an electric fan has replaced a mechanical engine-driven fan.

The thermostat switch provides a temperature-controlled signal for the fan circuit. When coolant temperature reaches the switch’s activation point, the fan can turn on automatically. Once the system cools sufficiently, the fan switches off.

This provides convenient automatic operation without requiring the driver to continuously monitor a temperature gauge and manually control the radiator fan.

Designed for Relay-Controlled Fan Circuits

An electric radiator fan can draw substantial electrical current. The temperature switch should therefore be installed according to the electrical requirements of the specific cooling fan system.

For typical aftermarket installations, the temperature switch should be used as the control or trigger for an appropriately rated automotive relay, rather than carrying the full current of a high-amperage radiator fan unless the circuit is specifically designed and rated otherwise.

The relay handles the fan motor’s higher current load while the thermostat controls the relay circuit.

Always use an appropriately rated relay, fuse, wiring, terminals, and electrical connections for the fan’s current requirements.

Helps Correct Faulty Automatic Fan Operation

A defective or incorrectly operating fan temperature switch can contribute to symptoms such as:

Electric radiator fan does not activate when the engine becomes hot
Cooling fan remains on after coolant temperature decreases
Intermittent automatic fan operation
Fan operates at an incorrect temperature
Manual fan operation works but automatic control does not
Unstable or inconsistent fan cycling

These symptoms do not automatically prove that the temperature switch is defective.

Similar problems can result from a failed fan motor, relay, fuse, wiring connection, ground, coolant thermostat, low coolant level, restricted radiator, water pump problem, trapped air, or another cooling-system issue.

Proper diagnosis should be performed before replacing components.

Straightforward Thread-In Installation

Before installation, allow the engine to cool completely and safely relieve cooling-system pressure according to the vehicle manufacturer’s service procedure.

Install the temperature switch into a suitable 1/8″ NPT coolant port where the probe can accurately sense coolant temperature. Use an appropriate thread-sealing method that is compatible with the cooling system and the electrical requirements of the switch.

If the switch grounds through its threaded body, excessive insulating sealant can interfere with the electrical ground path. The exact wiring and grounding configuration should therefore be verified before installation.

After installation, connect the switch to the properly designed relay control circuit. Route wiring away from exhaust manifolds, headers, belts, pulleys, fans, and other hot or moving components.

Refill and bleed the cooling system as required, then verify that the fan activates and shuts off at the intended temperature range.

No Universal OBD-II Error Code

This American Volt-style radiator fan thermostat is a universal aftermarket temperature switch, not a vehicle-specific electronic coolant temperature sensor communicating directly with every factory ECU.

For that reason, there is no single OBD-II diagnostic trouble code that this switch universally resolves.

If a vehicle displays a cooling-system or coolant-temperature-related diagnostic code, diagnose that factory circuit according to the vehicle manufacturer’s service information before replacing components.

This switch should be replaced when testing confirms that the thermostat switch or its related fan-control circuit is faulty.

Rigorously Tested for Dependable Performance

Wholesale Sensors replacement temperature switches are designed for dependable operation in demanding automotive environments.

Each replacement is rigorously tested for temperature switching response, electrical continuity, connection integrity, repeatable ON/OFF operation, and overall functional performance.

The brass thread-in probe provides a durable sensing interface for compatible coolant applications, while the temperature-controlled design provides automatic radiator fan operation without unnecessary manual intervention.

12-Month Warranty and USA-Based Support

Wholesale Sensors specializes in dependable replacement temperature sensors, pressure sensors, thermistors, switches, probes, connectors, and related components for automotive, industrial, HVAC, appliance, commercial equipment, and pool and spa applications.

The Wholesale Sensors Replacement for American Volt Electric Radiator Fan Thermostat combines a 180°F fan activation temperature, 165°F shutoff temperature, and 1/8″ NPT thread-in brass probe for compatible custom and aftermarket electric cooling fan installations.

Every replacement includes a strong 12-month warranty and responsive USA-based product support, giving automotive technicians, restoration specialists, performance shops, hot rod builders, race teams, and DIY enthusiasts added confidence when installing or replacing an automatic electric radiator fan temperature switch.