Trying to get the ventilation system working. I used the diagram found here http://1bad6t.com/Maverick/repair/chassis_electrical_01a.html (thanks to rthomas). Is the vacuum tank located on the passenger side engine bay below the fuel system canister? And the heater water valve motor (I assume this is the heater control valve) is located in the engine bay as well? Image number 2 shows the "dash panel" which I'll assume is the firewall. I don't think my car had the vacuum motor when I acquired the vehicle. Second, I'm not sure if I understand what the water valve vacuum switch (which is supplied vacuum from the motor) controls? Thanks. Update: I've been reading the archives and I think the heater water valve vacuum motor is the heater control valve and the water valve vacuum switch controls the flow of hot air into the box, especially important for AC equipped cars, correct?
don't know why they call them...vac. motors...they are just...vac. pods... one is the...heater control valve...it opens and closes for water flow...$14 at your auto parts store.
Yes, the vacuum canister goes below the vapor canister right behind the passenger shock tower. Yes, it is important to keep the hot COOLANT out of the heater box when the AC is on. When the heater control valve closes when the AC is on, it shuts off all hot coolant from running through the heater core.
Many of the older vehicles before the mid 60s used a manual valve... Some had a cable and operated via knob plus there were even units that had a thumb screw on them that required opening the hood and cut off in the summer... Those were usually bare bones pickups(no A/C) that had almost no insulation so added to the summer heat even if the heater control was off...
that's another odd engineering thing about these cars...like tinted windows in A/C cars only...you would think the non A/C cars would have the ...heater control valve and tinted glass as a stock option...
