When it is hot outside, the A/C doesn't work, but when its cold outside, the heater doesn't work.

Any suggestions......winter is coming up fast!

 

Follow the DIY for the heater control repair. If not that make sure your AC is charged. May want to vacumm it out and recharge. Could be the AC clutch not engaging. Usually the temp control is broken tho and needs a quick solder. Could be something entirly different.