Heater-Air Conditioning Vacuum Power Unit 1963 Coupe deVille

I am not having issues with with my vacuum unit but have been looking at what it would take to replace it if became necessary. Can the 2 nuts that hold it to the rear plenum be reached from the inside without removing the plenum? The rear plenum is very close to the firewall and it appears that space is quite limited to access the nuts on the backside of the plenum.

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Permalink Reply by Kurt on May 31, 2024 at 8:14pm

I did mine working from inside with the glove box liner removed. Posted here https://6364cadillac.ning.com/forum/topics/recirculation-actuator-r...

Permalink Reply by John Cason Fudala on June 1, 2024 at 6:40am

The vacuum unit you are showing has already been replaced. The unit I am speaking about controls the flow of air between the floor/ac ducts. It is mounted inside the rear half of the heat/ac assembly and the retaining nuts are facing the firewall.

Permalink Reply by Kurt on June 1, 2024 at 1:21pm

Ah, I see. I haven't had the pleasure of replacing that yet.

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