SWITCH FAN CLUTCH

The Navistar International 1621011C91 is a temperature-sensitive electronic switch designed to control fan clutch engagement in heavy-duty truck cooling systems.
Activation Temperature: 150°F (65.5°C).
Weight: Approximately 0.29 lbs (0.13 kg).
Thread Size: Typically 1/2″-14 NPT, consistent with standard Navistar cooling switches like the 1685132C92.
Construction Material: High-conductivity metal housing with heatproof molded insulators.
Fitment: Direct-fit OEM replacement for Navistar International and Mack heavy-duty applications.