Out of stock
SKU: PRM19107
UPC: 749187191070
MPN: 19107
The PERMA-COOL Electric Fan Thermo Switch Screw-in 185deg F is a precision engine cooling component designed to automatically control electric cooling fans based on real-time coolant temperature. This temperature switch activates at 185 degrees Fahrenheit and deactivates at 165 degrees, providing reliable thermal management for street cars, hot rods, and custom builds where factory cooling systems require auxiliary fan support. Mechanics and enthusiasts rely on screw-in thermo switches to eliminate the guesswork of manual fan control and prevent engine overheating during idle, traffic, or sustained performance driving.
This switch features a 1/2 inch NPT threaded connection, allowing direct installation into compatible engine blocks or thermostat housings without modification. The 185-degree activation threshold is calibrated to engage the electric fan when coolant reaches peak operational temperature, while the 165-degree cut-off point minimizes parasitic drag and fuel consumption once thermal equilibrium is restored. The compact screw-in design (2.85 x 1.05 x 4.05 inches, weighing only 0.08 lbs) integrates seamlessly into tight engine compartments and delivers consistent performance across thousands of thermal cycles, making it an ideal upgrade for vehicles with upgraded ignition systems, carburetors, or forced induction modifications that generate excess underhood heat.
This thermo switch benefits owners of street-driven muscle cars, vintage restorations, and modern engine swaps where engine bay temperatures demand active cooling management. Installation requires a tapped 1/2 NPT boss on the engine block or cylinder head; verify port location and clearance before ordering. The switch pairs with any 12V or 24V electric cooling fan and relay system, and its durable construction withstands continuous cycling in high-temperature environments. For vehicles experiencing cooling system stress at stoplights, car shows, or towing conditions, this switch delivers automatic fan engagement that protects engine longevity without driver intervention.
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