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more truck work.
Reading the ford forum I found yak about installing a heater control cut off valve.
On that (and many fords IIRC) model ford left the heat core on all the time, and uses a blend door to cut off in max ac mode, but its still in the cab with you and if the blend door leaks you get hot air from the core.
junk yard time find a valve that was used in the later model year (same gen, guess ford decided to use the valve when they went from R-12 to R134a, perhaps it needed a little help keeping cool), grabbed some extra vacuum lines and fittings (needed a T).
before installing valve I wanted to run the vac lines, so had to poke a hole thru a firewall plug, fished a plastic vac line into place, temp hooked up the servo on the valve and then installed the T on the max AC sero (applies vac to operate the recirculate door, so only Max AC will cut out the heater core, this is the way it was plumbed at the factory).
I did a quick test with the eng running to confirm no vac leaks and the servo operated the valve as it should. all good so only need to cut the heater hoses and install. This model uses recirculate valve so both hoses must be cut and 4 connections made.
while at the yard I picked a spare ECU module and power amp, they were cheap so stocked up.
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