My heater has stopped working. It 1st started on the weekend, where despite what buttons were pushed nothing worked. Then after about 1 hour it came on out of the blue. At the time it seemed to be on defrost mode again despite what buttons were pushed. Then it worked fine for about three days on auto, where I didn't touch anything except adjusting the temp, afraid it would die on me again. Then sure enough last night it died - and it seemed after going over a bump. The blower motor was new when I purchased the car a month ago (saw receipt), and I looked at the small fuse outside of the fuse box and it looked okay.

I can hear the buttons working in the dash, but have the sense it's electrical but not sure where else to check. I've had the heater control unit out to make sure nothing was loose, but that looked fine. Any suggestion.

1st we tackle this, then I have questions on why the seat heaters don't work, buttons do light up okay, but no warm seats?