Bruce Brown wrote:I had this problem also, sparkplug wires would burn, the plastic on the shifting cable melted where it was hard to shift, along with other wire components that melted. Long runs uphill in the summer would cause the heat build up. Check to see if the house builder supplied air dams to force air through the radiator or is there open areas where the air could go under or around the radiator. Once I added air dams the heat was manageable. Adding headers further reduced the heat to where the fan clutch seldom engaged. The 7.3L is a big block eng like the old 460's and 454's(7.5L and 7.4L) which produced a lot of heat.
I can see nothing showing up as being wrong on the Ford side, it seems the issues may be caused by the house builder not letting in enough air. We had a Fleetwood Flair that suffered the same.
