Anybody had any luck with working on blend doors? Car is blowing hot, 85 on the passenger side and 100 on the driver side ( it is 90 here today). It will blow hotter if the heat is turned to 90, but that is as cold as it will get. The A/C is fully charged with no leaks, so best guess it a blend door motor or two are not working. While I hate spending money on parts that I don't need, I feel the same way taking it to someone for work I could do, if I knew what the problem was. Any educated guesses?