Hello everyone...newbie here. I've had this issue for about 2 years now and it's getting to be a bit irritating. Mainly in spring and fall where I don't need the AC or Heat on their max, my "mixer" will sometimes keep the heat on max hot. I have to shut the car off for a while and restart. Even when the "mixer" is working, 95% of the turn is hot and 5% is cooler. I believe this is a common problem and I'm handy so I'd like to fix it. Any ideas?? Thanks.