1960s 1962 CDV Air Conditioning Vacuum/Baffle issues/solutions?

[dixoncj]

For the AC gurus:

I've been tracking/trying to solve AirCond vacuum actuator/baffle issues on my 1962 CoupeDe. The car is very, very original and has working R12 charged AC. I don't think it's even ever been cracked open. Original vacuum hoses are generally even in good shape.

1. When I first started working on the AC, I found that no air would come out of the dash vents when the ac system was turned on. I tracked that to the lower vacuum actuator that opens the baffle door that then directs air over the evaporator and through the dash vents. There was - and still is - no vacuum coming from the actuator that engages the evaporator actuator. So I bypassed it and installed a splitter coupler and applied vacuum directly from the booster canister in front of the driver's side windshield and voila - air out of the dash vents.

2. That said, this is obviously not an ideal solution. First, when the system is turned on, there's still some non-heated air that comes out of the heater vent at my feet.I used to have another 62CDV years ago and I don't recall air coming out of the floor heater outlet when AC was engaged. (Heater slider seems to be engaging/working properly as is the defrost/defog slider). Bottom line, I don't seem to be getting full airflow through the evaporator to the AC vents because of this. I suspect some other baffle back there is still partially open. Any wisdom on which baffle this would be and which vacuum circuit line might control it?

2. Prior to yesterday, the air out of the vents w/AC on was cool and slider fully engaged was cool but not cold. The low-side hoses got pretty chilly, and the site glass had bubbles - so obviously I needed an R12 charge. So I managed to score a 50 POUND can of original R12 on FB marketplace for a stupid cheap price this weekend. So I gassed up the AC yesterday, checked pressures - which are now within spec - and now it's blowing quite cold through the vents. I don't have a thermometer on it, but it's cold - and frost forms on the low side hose fittings and condensation forms on the vents in this humid Charleston weather. Few, if any bubbles now in the site glass though the glass is kind of hazed over so it's tough to tell if there are zero bubbles. So I think I'm now good there.

3. My emergency brake is not disengaging via vacuum when the car is running--it stays engaged and I have to manually disengage it. The e-Brake actuator works when I put a hand vacuum pump on it. Since the AC baffle actuator and the E-brake are apparently on the same vacuum circuit - this obviously is telling me that I have an issue with vacuum to this circuit. I have the diagram in the shop manual, but it's honestly not very clear as to where the actual source is for the vacuum on that circuit - in other words, where does that originating vacuum line actually leave the motor and come through the firewall and where does it split to deliver vacuum to both the evaporator vent actuator and the e-brake actuator? I'm assuming all the behind the dash vacuum comes from the canister but maybe not? Hoping I don't need to pull the dash to figure this one out - so any intel would be greatly appreciated.