I'm having a problem with my 1993 850 GLT. On extremely hot days, the car may start and run for awhile, but will start slowly loosing power and revs drop off. Eventually it will die until it can cool off. The temp gauge stays normal, there is no Check Engine light therefore the OBD I shows no codes, and I don't hear any unusual noises. One thing I notice is that I never hear the radiator fan kick on unless the A/C is on. This problem only happens when it is very hot outside (upper 90s or especially over 100 degrees). Any ideas?