Heating problem

[Rolfe]

I watched a video where they ran two identical cars, but one had a heat pump and the other didn't, along the same route together. The one with the heat pump only beat the one without by a pretty small margin on range.

I like the heater I have, but I noticed something interesting last week. The car had just come back from its service, and I suddenly had this thing where I was too warm, but if I reduced the temperature by a single degree it was blowing cold. Others have reported this, but I'd never experienced it. I checked the HVAC controls, and none of the possible vents was selected to blow air! I selected footwells only, and miraculously the thing started functioning as usual again.

 

[mg4mc]

I found that I had to have all the vents active to prevent the binary off/on effect of the heating.