After owning my ’71 for more than 5 years I’ve just discovered today that ‘Astro ventilation’ etched on the door glass is not just a marketing slogan but refers to an actual functional ventilation system.

Functional turns out to be a bit of an exaggeration in my case but it’s hardly surprising I hadn’t noticed its presence before since my car is a ‘Vert and 99.9% of my driving is done with the top down – when there is always a happy excess of ventilation.
When raising my roof this morning (the car’s outside at the moment and we have at last been getting some showers) I noticed for the first time what is obviously a vacuum actuator in the right corner of the rear bulkhead and it appears coupled to what I had previously thought were just passive ventilation flaps. There’s nothing in the owner’s handbook about how this mechanism might operate but a web search tells me that with the heater control off.....

.......the vent flaps remain open, allowing through ventilation from the front of the dash to the rear of the cabin but when heat is selected the flaps close to allow the cabin to warm up.
I guess you’re never too old to learn something new?

So, I fire up to generate some vacuum and twiddle the heater thumb-wheel and sure enough the actuator has a brave attempt at moving the flaps. It’s only partially successful since some of the supporting metalwork is distorted....

.....and most of the hinge points in the linkage are pretty gummed up (arrowed yellow below). After some straightening, cleaning, and lubrication, actuation is much improved although I notice one of the brackets securing the left-hand door is broken. I fashion a piece of wire as a clip to temporarily repair this (arrowed red)......

.....and we finally seem to have Astro ventilation doing what it’s supposed to.
I’m not sure I’ve achieved a noticeable improvement, since so far I’m not really sure if the heater is very effective; there always seems to be a generous amount of warmth coming from other sources.
What I still find puzzling is the fitting of the carpet around the flaps. It’s stuck to the bulkhead below the flaps but untidily hangs free to allow the vents to operate.

Does this look normal or is mine just an untidy car?
