M A Fry

G'day All,
As some of you already know, my 69 vert has been converted to RH drive
for Australian roads. I have recently partially dismantled my vet for
painting and am now in the process of carefully putting it back together
and sorting out some of the things that don't work quite like they should.

Well one of those things is the heater controls. Below is a diagram showing
the std heater vacuum routing for my non ac car.


Now you have to rotate that image 180deg. in your mind to be able to
relate it to what is in my vet, which puts valve C underneath the heater
box and valve D on the right side. Now what this does, if I have the
valve operations correct, is make the flaps inside the heater box work in
the opposite direction to what is now required? Is that right?

Assuming I am right, I need to change the operation of the valves to
correct them for new orientation of the heater box. So, I can swap the
vacuum lines on valve D and that will make it work the opposite way.
The dilemma I face, is do I need to change the vacuum hose routing for
valve C and valve E (rear astro vents) and if so where do I need to
make the changes - from where to where?

I hope I haven't confused you all and look forward to any and all advise
given.

Thanks,

Mark

Alan 71

Hi Mark,
I don't think it changes anything.
Valves C and D don't know they're upside down (they still control temp and air direction in the same way) and valve E has no idea you've flipped the heater air box (it only cares about it's vacuum source, which hasn't changed).
I THINK!
Regards,
Alan

M A Fry

G'day Alan,
Thanks for your help. I agree that valves C & E only care about their
vacuum source, but it's the order in which they operate which is important!
As far as valve D is concerned, the vacuum lines are located one on the
front side of the diaphragm (blue line) and one on the rear side (red line),
therefore, it is logical to assume that the valve works just like the
headlight actuators, where one line vents when vacuum is applied to
the other line. Now if I am right, these lines need to be reversed to
allow the valve to work in the opposite order, as it is now upside down.

The trick now as I see it, is to have valves C & E work in the correct
order of operation which must require some rerouting of the vacuum
lines, but I am not sure which way. Valve C certainly is required to
operate in the reverse order and therefore valve E's order of operation
is also required to change. If any one can enlighten me, I would be
most grateful.

Regards,

Mark