Just had a pleasant six hr ride from Vermont with no heat or ac(defrost). Was initially working this morning in sub zero temps but then just quit. Climate control lights are out and will not switch to warm or divert from floor but blower fan works. Assumed it may be a fuse but didn't find one blown that i would think would be associated as described in owners manual. One other thing I found was the headlights will not work in auto and when switched to this position, the dash headlight indicator goes out.

Any help would be greatly appreciated,
Thanks,
Jim

 

The sun sensor is connected in some way to the climate controls so that is probably the connection to the automatic headlights not working. Was having trouble viewing the wiring manual.

What year is your truck and does it have manual or auto climate control?

 

2011

Manual Climate Control

Do you have a copy of the wiring schematic?

 

When you start your truck, do you hear any thumping or clapping noise coming from the HVAC system?

 

Well, started checking any fuse that may be remotely associated. Started the truck and it was working again. Great. I guess I have a loose connection. Anyone know where I can Get A schematic?