My understanding is they that come on when your in-dash air is on the max setting or whenever your engine cooling system calls for it to come on.
__________________
Steve & Nancy
2005 Itasca Sunrise 33', W20 Chassis, Ultrapower, Henderson Trac Bar
2012 Chevy Captiva Sport AWD, ReadyBrute Elite Tow Bar, Blue Ox Base Plate, Protect-A-Tow
|