I put the Vac operated shut-off valve in the hose coming off the head. Valve was NAPA part # BK6601866. Put the vac t in the white line that is in pass side cab just above the carpet that goes to the silver vac cannister, there is a rubber plug in the firewall just to the right of cannister I cut small hole in & ran vac line through. It shuts off the flow to heat core in the max A/C. Made a noticeable diff in cab temp. There are a bunch of diff ways to do this on FTE.
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2000 F-250 SCLB 2wd 7.3 auto PHP stock-65t-80dd-120race-high idle-no start 4"tb exh, wicked wheel, 3 guages, AIS, coolant filt,
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