I hope someone could offer some help. I have searched the forum and don't really see the same problem listed anywhere. I have an intermittent problem where the climate control will not blow out cold or hot air. This summer I turned on the AC and it was only blowing ambient temp air. I turned the truck off and then restarted it and it worked fine. This didn't happen again until yesterday when I left work and tried to turn on the heat... all the way home only ambient temp coming out of the vent. I tried stopping at the store and restarting the engine... no good. In fact, it didn't work this morning either, but at lunch it finally started blowing hot air again. I thought perhaps a relay is sticking but not sure where to start looking. I have a 2006 5.4L Scab Lariat.

Thanks!

 

Use the search function. You will get plenty off possibilities. Its sounds as if the blend door actuator is sticking.