I thought my 78-79 fords always had 2 contacts for the ac/fan motor in that controller ,my controller is leaking vacuum and I was going to replace but I thought mine had 2 contacts and the units spec for 79 is one contact can anyone show a pic or any info to determine which one and the difference? I have 4 from 78-79 and all are the same.

 

1973/79 F100/350 & 1978/79 Bronco with factory installed integral A/C:

D5TZ-19B888-A (replaced D3TZ-19B888-A) .. A/C Vacuum Controlled Selector Valve Assy (Motorcraft YH-285) / Obsolete

This valve mounts to the backside of the A/C/Heater control panel, all the vacuum lines connect to it. It also contains the "Kicker Switch" to turn on the A/C

CARPENTER NOS OBSOLETE PARTS in Concord NC has 94 = 800-476-9653.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
D3AZ-19986-A .. Blower Switch (Motorcraft YH-2) / Obsolete ~ 40+ Available NOS

1973/77 F100/350 w/heater or A/C / 1978 F100/350 & Bronco w/heater or A/C before serial number CA0,001 // 1973/74 LTD with manual A/C (without A.T.C. = Automatic Temperature Control).
--------------------
D5AZ-19986-A .. Blower Switch (Motorcraft YH-264) / Obsolete ~ 52+ Available NOS

1978 F100/350 & Bronco w/heater or A/C from serial number CA0,001 / Ditto 1979 F100/350 & Bronco.

1975/79 LTD with manual A/C / 1975/80 Granada/Monarch with A/C / 1977/78 Mustang II with A/C / 1977/80 Pinto/Bobcat & Lincoln Versailles with A/C

 

how about a heater core oem brSS instead of aluminum?

 

In 1983, the IDIOTS at FoMoCo replaced the original 1973/79 heater cores. These are shaped differently, so an insulation kit had to be purchased to install them.

Even though these heater cores have 1983 part numbers, they were not used after 1979!

The original part number:

D3TZ-18476-A .. Heater Core-Use with factory installed integral A/C & Hi/Lo Comfort Vent System / Marked: D3TE-18476-AA / Obsolete/Replaced

1973/79 F100/350 & 1978/79 Bronco.

KAMA OBSOLETE PARTS in East Bethel MN has 1 = 763-434-0123.

MCDONALD OBSOLETE PARTS in Rockport IN has 2 = 812-359-4965.

 

thanks numbers The "NEW" ones sure don't work right. The old ones made some real heat, the new ones run wide open all the time. Barely defrost the glass.