Thermostat?
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The hoses are probably clear? Try to determine the inlet and outlet hose. Backflush or, direct a strong stream of water in the opposite direction of normal flow. Think heater hose is 5/8"? Maybe a female garden hose end could be temporarily installed. Betcha a bunch of crud gets dislodged. Even if that's not the problem, it probably needs it anyway.
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D4AZ-18495-A (replaced C7SZ-18495-A & D1AZ-18495-B) .. Vacuum Controlled Heater Water Valve (Motorcraft YG-136) / Available from Ford
1973/79 F100/350 & 1978/79 Bronco with factory installed integral A/C // With factory A/C: 1967/76 Thunderbird; 1969/73 Mustang/Cougar; 1969/78 Galaxie/LTD.
1972/76 Torino/Ranchero; 1974/78 Pinto/Bobcat; 1975/91 Econoline.
1973/79 F100/350 & 1978/79 Bronco with factory installed integral A/C // With factory A/C: 1967/76 Thunderbird; 1969/73 Mustang/Cougar; 1969/78 Galaxie/LTD.
1972/76 Torino/Ranchero; 1974/78 Pinto/Bobcat; 1975/91 Econoline.
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