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D7TZ-19805-A .. A/C Heater Blower Motor & Balance Wheel Assy-Use with factory installed integral A/C or Hi/Lo Comfort Vent System (Motorcraft MM-368) / Obsolete
1977 F100/350 from serial number O20,001 / 1978/79 F100/350 & Bronco.
TRI-CITY AUTO WAREHOUSE in Fort Wayne IN has 1 = 260-471-1649.
------------------------------------------------------------------------------- D4AZ-18495-A (replaced D1AZ-18495-A) .. Vacuum Controlled Heater Water Valve-Use with factory installed integral A/C (Motorcraft YG-136) / Available from Ford & auto parts stores.
This valve is a notorious POS! It's very prone to getting stuck in the open or closed or partially open positions.
+1 on the heater valve, get the all plastic one AC Delco 15-5812. Not to hijack the thread but has anyone heard of a bypass valve (Vacuum close position) that works on our trucks