I need an in-dash vacuum control for the bi-level function for my F-100. The dash and a/c components are from a 1978 F-100. Have tried LMR and National Parts Depot. No luck. Thanks for any leads.

 

Look at the two following illustrations. In the first picture, is the part you're talking about basic p/n 18502 or19B888? If not, what part or you talking about.
Let me know the basic p/n and I'll see if I can locate it.
Click on the .pdf link to view the illustrations.

 

I think its the 18A318. I will get the broken part from the mechanic tomorrow and email you back.
Thanks.

 

There are three different 18A318 vacuum motors, depending on the function code listed in the diagram.
Motor assy, vacuum control.
Function 1 or 2 D7TZ-18A318-A
Function 6 D3TZ-18A318-A
Function 7 D3TZ-18A318-B
I couldn't locate any of the first p/n
1 of the second, NOS Parts Source (913) 220-5746
1 of the third, Antique Auto Arlington (817) 275-2381

 

Dennis Carpenter has a few of them in thier catalog.

 

Thanks. I spoke with the Dennis Carpenter folk; I may have had an incorrect part number as they said they did not have it. I hope to retrieve the old one from the mechanic so I can get an accurate picture and part number. It's the vacuum actuator for the 'hi/lo' heater-ac control. There are 3 vacuum actuators behind the dash and apparently they are all different.
Thanks again.

 

I am in need of a vacuum control valve 76F100 Air-Conditioning heating valve for the dash the lower slide arm on the dash

 

Lower slide arm is the bigger switch of the 2. How many vacuum ports does your have, 8 or 9 ? And how man blades/fins on the elec connector 2 or 3? I might have one left in my parts shed. I can look this weekend.

FTE safe seller. https://www.ford-trucks.com/forums/forum238/