I think this has come up before, but the other day, I was troubleshooting my non-functioning power seat switch, and found that it was nothing but a blown fuse. Doh! So while I had the fuse box open, I decided to check all the other fuses, and found the #11, a 15 amp fuse protecting the cigarette lighter and associated assemblies, was also blown. So I replaced it, and, voila! - the interior temperature gauge now reads in both fahrenheit and celcius! And it switches back and forth between the two. So the moral of this story is, it isn't a bad idea to periodically check through your fuses, and replace any that are burnt out. Now if only I had a theory as to what may have caused these two particular fuses to blow...
