I've got a 95 Bonneville. This system was not working correctly, when you would put the air on, it would be blazing hot and if you put the heat on, it would come out freezing cold. In order to make these work properly, I had to shut the car off and re-start it and maybe after doing this 5 or more times, then it would start working properly. Well, over the summer, we tried to put a new brain box in (whatever it is called it was located under the glove box) This did nothing, except now after putting the old one back in and trying to move some switches around on it with no success, whenever I get in the car, the ext. temp. says 90 and then the temp. read out just goes away and I never get any heat no matter how many times I shut the car off and re-start it. Has this happened to anyone else here?? I guess I can live with it, but driving to work when it'* one below zero today was not something I enjoyed. Thanks .