ok so my buddy has a 1989 F-250 plow truck, and we put a new motor in it this fall. it has a 351W in it and its all stock EFI. There is no ac on this truck any more, no compressor at all. So he was warming it up the other day to plow, and when he went to turn on the heater he hit the A/C button and the truck shut off, and wont restart. All the electronics work, ie lights, horn, guages, and the truck turns over, but will not start.
Any ideas?
Any ideas?