I have done some searching around and I cannot find a detailed vacuum diagram for a factory installed ac system. I took detailed pictures when I disassembled the dash but one of my kids erased the memory and now I am without a clue what hose goes to what to operate my defrost, heat, etc.

Thank you in advance for your help.

 

Is this for the '75 in your signature? The reason I ask is because Ford made some changes in the A/C system in late '75 including some changes in the vacuum routing. The serial number break is X20,001. Before that number is the early system, from that number on is the late system. An easy way to tell (unless someone has changed it) which system you have is, how many vacuum lines go to the water control valve in one of the heater hoses? If there are two, you have the early system. One means the later system.

 

Here is the diagram for the early sytem.

 

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Thank you very much gentlemen as this helps me so very much. The PO removed the A/C system completely just leaving the box, I live in western Washington state were you may need the AC for two day out of the year, never really gets above 80 deg. I will have to look and see if I can still determine if it is an early or late model A/C system.

 

I looked under the hood and the water control valve has one vacuum line to it so it is one of the later models, Mike do you have a diagram like the early model for the late model setup?

 

I don't have the late diagram but I do have a bunch of pictures that I took when I tore my (late) system down, I'll post them in a little bit.

 

Looking at the pictures, it's kind of hard to see the line colors clearly so I'm going to describe what goes where, hope this helps.
You'll understand when you look at the pictures that I am posting.
There are three vacuum motors under the dash, two on the plenum over the transmission tunnel and one all the way to the right, by the cowl vent.
The hose with the white strip goes to the vacuum motor all the way to the right by the cowl vent.
The other two motors have two hoses each. One motor is gold colored, the other, silver.
On the silver one, the orange hose goes to the end, the blue stripe to the side.
The gold one has the yellow hose going to the end and the red hose goes to the side.
The brown stripe hose goes to the hot water valve in the engine compartment.
The black hose goes to the vacuum reservoir in the engine compartment.
The green stripe hose goes between the upper and lower vacuum switches on the control panel.

 

Thank You very much Mike, this will help complete the install.

 

Maybe this will too? I'd just ck the links 1st....sorry if the diagrams are not what you need or help at all.

1979 F100 Air Conditioning

http://www.ncspecialties.com/autobody/heater/index.htm

http://cgfordparts.com/wwwsectionfil...a_c.html#SEALS