Coolant fan is not operating automatically. It has a new temperature sending unit.
Wednesday, December 20th, 2017 AT 8:26 PM
1 Reply
CARADIODOC
MECHANIC
33,871 POSTS
Unplug the two-wire coolant temperature sensor while the ignition switch is on. The engine computer should turn the radiator fan on by default. If it does, the system is working. A lot of GM engines have to get uncommonly hot before the fan turns on, possibly as high as 226 degrees.