My 85 300D AC works great most of the time. Blows cold, but when I idle, particularly in hot weather, it stops blowing cold. Am copncerned about aux fan. Yesterday it was blowing warm and the aux fan was not on. What makes it come on and when does this happen? I beleive there is a switch/relay at the front right of engine area. Could thois be bad? Any suggestions on how to diagnose the problem.
thanks
