Mishimoto Adjustable Electric Fan Controller Kit – 1/8" NPT Thread-In Temp Sensor

Take full, precise control of your electric cooling fan with the Mishimoto Adjustable Electric Fan Controller Kit — a universal 12V electric fan controller with adjustable activation temperature, built-in A/C override, and a 1/8" NPT thread-in temperature sensor for clean, secure installation in any radiator, coolant line, or fitting with a 1/8" NPT port. Adjustable from 150°F to 240°F with a 10°F hysteresis deactivation threshold, this controller gives you precise fan activation control for any custom cooling system build — backed by Mishimoto’s Lifetime Warranty.

Key Features:

• Adjustable activation temperature — 150°F to 240°F (65°C to 115°C) activation range for precise fan-on temperature tuning
• 10°F hysteresis deactivation — fan deactivates once coolant temperature drops 10°F below the activation setpoint, preventing rapid on/off cycling
• 1/8" NPT thread-in temperature sensor — secure, leak-free sensor installation in any radiator, coolant fitting, or line with a 1/8" NPT port
• Built-in A/C override — automatically activates the fan when the A/C system is engaged, regardless of coolant temperature
• Universal 12V compatibility — compatible with any 12V electric cooling fan
• 25 amp maximum — supports 1 or 2 electric fans with a combined draw of 25 amps or less
• Complete kit — includes all necessary components for installation
• Mishimoto Lifetime Warranty — backed by Mishimoto’s Lifetime Warranty for superior product quality and craftsmanship

Performance Benefits:

• Precise Fan Activation Control: Adjustable 150–40°F activation range allows you to set the exact coolant temperature at which your fan engages — optimizing cooling system efficiency for your specific engine, climate, and driving conditions
• Hysteresis Protection: The 10°F deactivation offset prevents the fan from rapidly cycling on and off around the activation setpoint — reducing fan motor wear and electrical system stress
• A/C System Integration: Built-in A/C override ensures the cooling fan runs whenever the A/C compressor is active, preventing condenser overheating at low vehicle speeds and idle — a critical feature for any build running air conditioning
• Secure Sensor Mounting: 1/8" NPT thread-in sensor provides a secure, vibration-resistant, leak-free temperature measurement point versus clip-on or probe-style sensors that can shift position or lose contact
• Dual Fan Support: 25 amp capacity supports single or dual electric fan setups for builds requiring maximum cooling airflow

Specifications:

• Brand: Mishimoto
• Part Number: MMFAN-CNTL-U18NPT
• Sensor Type: 1/8" NPT thread-in
• Activation Range: 150°F – 240°F (adjustable)
• Deactivation Hysteresis: 10°F below activation setpoint
• Voltage: 12V DC
• Maximum Current: 25 amps (combined, 1–2 fans)
• A/C Override: Yes (built-in)
• Warranty: Mishimoto Lifetime Warranty

Fitment / Compatibility:

• Universal — compatible with any 12V electric cooling fan drawing 25 amps or less (combined for dual fan setups)
• Sensor requires a 1/8" NPT threaded port in the radiator, coolant fitting, or coolant line — verify your cooling system has or can accommodate a 1/8" NPT port before ordering
• If your cooling system does not have a 1/8" NPT port, consider the Mishimoto probe-style sensor variant instead
• Suitable for custom cooling system builds, engine swaps, radiator upgrades, and any application requiring aftermarket electric fan control

What’s Included:

• Mishimoto adjustable fan controller module
• 1/8" NPT thread-in temperature sensor
• All wiring and connectors for installation
• Installation instructions

Installation Notes:

• Verify your cooling system has a 1/8" NPT threaded port for the temperature sensor before installation
• Apply thread sealant (PTFE tape or liquid sealant) to the sensor threads before installation to ensure a leak-free seal
• Route wiring away from heat sources, sharp edges, and moving components
• Use an appropriately rated relay if your fan draws close to or exceeds 25 amps — verify your fan’s amp draw before installation
• Connect the A/C override wire to the A/C compressor signal wire to enable automatic fan activation with A/C
• Set the activation temperature to suit your engine’s operating temperature range — typically 185–200°F for most performance applications
• Test fan activation by warming the engine to the setpoint temperature and verifying the fan engages correctly

NPT vs. Probe-Style Sensor:

Mishimoto offers this fan controller in two sensor configurations — the 1/8" NPT thread-in sensor (this kit) and a probe-style sensor. The NPT thread-in sensor installs directly into a 1/8" NPT threaded port in the radiator tank, coolant fitting, or coolant line, providing a secure, vibration-resistant, leak-free temperature measurement point. The probe-style sensor clamps or clips to a coolant hose and measures temperature through the hose wall. The NPT thread-in sensor is the preferred choice for builds with an available 1/8" NPT port — it provides more accurate, consistent temperature measurement and eliminates the risk of the sensor shifting position or losing contact with the hose.

Why Mishimoto?

Mishimoto is one of the most recognized names in performance cooling components, with a comprehensive lineup of aluminum radiators, intercoolers, silicone hoses, fan shrouds, and cooling accessories for import and domestic performance vehicles. Their fan controller kit is a universal solution engineered for the demands of custom cooling system builds — backed by Mishimoto’s Lifetime Warranty for long-term reliability and peace of mind.

Perfect For:

• Engine swap builds requiring aftermarket electric fan control independent of the factory ECU
• Custom radiator and cooling system builds using electric fans without factory fan control
• Builds upgrading from a mechanical fan to an electric fan and requiring a standalone controller
• Any 12V electric fan installation requiring adjustable temperature-controlled activation with A/C override
• Dual electric fan setups drawing a combined 25 amps or less

Pro Tip: Set your fan activation temperature 10–15°F below your engine’s target operating temperature to ensure the fan engages before coolant temperatures climb above the ideal range — not after. For most performance applications, an activation setpoint of 185–195°F works well with a 195–205°F target operating temperature.

Note: This kit requires a 1/8" NPT threaded port in your cooling system for the temperature sensor. If your radiator or coolant fittings do not have a 1/8" NPT port, use the probe-style sensor variant or install a 1/8" NPT bung in your coolant system before ordering this kit.