swen2decr

I bought a 1990 Legacy for my daughter 1 year ago but now for some reason the fan will not run all the time. The a/c will work only if it cool outside, same with the heater. When the sun hits the car and warms her up it won't work. I took it in to my mechanic whom I've know for years and trust. He spent 5 hrs. and several calls to the Subaru dealer mechanics and they just sent him on a goose chase with no reward. Help please. Thanks