GERALD´S CADILLACS


WWW.ELDORADO-SEVILLE.COM

AC Problem

The blower motor on my 67 did not come one when I switched on any heating or cooling position. It sometimes comes on in the "ICE" position but not always. After lots of searching I found out that the vacuum master switch does not get enough vacuum to be switched on. When I push the backside of it - everything works as it should. Of course that´s no real solution. Looks like my system will need a good overhaul.
Three parts could cause this problem:

  • The dash switch with its rotary valve from where I can hear a slight hissing noise,
  • the power servo on the firewall
  • or the master switch itself - what I doubt.

As I hate when something does not work on my cars I ordered all the parts. I found a good source which sells all these parts rebuilt. Hopefully they will arrive soon as I would like to have this issue resolved before the Cadillac Big Meet. It should not be too much of a hassle to install them when they are here.

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The power servo
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The power servo and master switch

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The electrical circuit of the Air Conditioning system of the 1967 Cadillac DeVille in a digram


Here is a video about the Master Switch that a gentleman posted on youtube

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