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living in Florida means you want MAX AC from your car or truck. The 1st gen explorers did not have a means to turn off the hot water to the heater core (installed inside the truck under the dash) until 1994. I presume the use of 134a vs R-12 may have prompted ford to look at ways of maximizing the cooling (presuming R-12 was better than the 134a) since I think the 134a started in 1994. Anyway rarely needing heat, I opted to add this cutoff valve, tied into the vacuum circuit of the max AC servo, thereby cutting off the heat completely so no radiant heat or if the blend door does not seal perfectly no heat from air leakage thru the radiator.
I went back and got that heat hose fully seated after reaming the hose a bit on the one that was not fully seated. I also stuffed the insulation and got the metal foil tape to fix the missing insulation over the evaporator box.