In Line Thermostat Switc -6AN

The In Line Thermostat Switch -6AN by PERMA-COOL is an essential component for any serious automotive enthusiast looking to optimize engine cooling performance. This compact inline thermostat switch integrates directly into your coolant circuit, allowing precise monitoring and control of coolant temperature before it reaches the radiator or overflow systems. Whether you're building a high-performance street machine, tuning a track car, or managing cooling on a custom engine swap, this -6AN fitting size makes it a versatile solution for modern fuel-injected and carbureted applications alike.

The thermostat switch functions by interrupting or completing an electrical circuit at a predetermined coolant temperature, enabling you to trigger auxiliary cooling fans, shift strategies, or fuel system adjustments based on real-time engine heat. PERMA-COOL designs this unit with precision-machined aluminum and brass internals to ensure durability under constant thermal cycling and high-pressure coolant flow. The -6AN AN (Army-Navy) thread standard provides a secure, leak-proof connection and allows seamless integration into existing braided hose systems or hard-line cooling circuits, making installation straightforward for mechanics familiar with hydraulic line work.

Street rodders, engine builders, and tuners benefit most from this thermostat switch when retrofitting modern engine management or electric fan setups into older chassis. It's equally valuable in LS, small-block Chevy, and import engine conversions where factory-integrated temperature sensors may be incompatible with your selected radiator or cooling configuration. At just 0.14 lbs and measuring 3.95 × 1.35 × 4.4 inches, the compact footprint fits easily into tight engine bays without requiring custom brackets or relocating other components. Always verify your target switch temperature range and electrical load requirements before purchase to ensure compatibility with your fan controller or engine management module.