Where does the Vacuum come from for the heat and air controls on my 351 Windsor.
It comes from the engine.
Yet again a worthless response…
The vac is connected to a “tree” at the back of the motor. It goes to a vac can under the pass side fender. It has 2 connections. One to the motor/tree & the other goes thru the firewall and to the controls for the heater/air conditioner.
I have found that after 50 + years the rubber gets brittle & will crack where it connects to the hose barbs. Suggestion is to replace them for another 50 years hopefully!
To add a visual of Cougar_Bill’s post
WCCC has some great free resources to download, the electrical and vacuum diaagrams
THANKS !
Now that’s a great post to help all looking for this info!
1969 Cougar XR7 351 windsor with a/c. My car has 2 canisters both on the passenger side tied together with the 1/4" vac hose the 1/16 hose from the cannister closest to the firewall witch also has a 1/4 nipple goes into the switch on the heater box the 1\16 hose from the water valve goes to the other side of the switch, Does someone have a pic of how the vacuum comes off of the Tree. How it was done out of the factory. The car has a/c. Where it splits off to the canisters on the passenger side. I have checked and replaced all the hoses all the actuators are good. Whats happening is the heater control wont activate the actuators at all when i switch to floor it doesnt work so my guess is that its vacuum related or i have a bad heater control unit.
Typically if the AC vacuum actuators don’t work it is because the headlamp actuator is bad. The way to find out is to isolate the system in question to see if it works properly. The brake booster is another vacuum operated system that can fail.
The AC actuators are normally the most reliable part of the system. You need a factory shop manual to sort it all out.
I have it sorted out just need a pic of how all the vaccuum is routed off of the tree.