Flex-a-lite 31165 - Flex-a-lite Variable Speed Control

Attaches to or near electric fan. Senses coolant temp via the radiator core and sets the fan speed from 60% to 100%, depending on built-in fan thermostat setting. Allows greater control over engine temperature, reduces charging spikes and current load on charging system and directs fan to run for 30 seconds after the vehicle is turned off.