compass and outside tempature

[sandibeaches5]

My 2000 buick compass has stopped working it reads 100 all the time and the out side temp. says 136 any ideas whats wrong?

[tman]

ummm, try calibrating the compass mirror by driving around in circles in a parking lot.

[sandibeaches5]

I followed the instructions in the book numerous times, once it fixed it but it went back to 100 again after a while. Some times it will start working by its self but it is only for a very short time.