Heater motor done?
Heater motor would make a crazy whining/grinding sound every once ina while .. and last night, it just plain quit on me. Sound like a fuse/relay or fan motor failure?
The blower motor is probably dead if it does this on all settings (e.g. "Vent, A/C, Defog)
Search GMC Jimmy Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
GMC Jimmy Experts