1964 deville...A/C not Blowing
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The Classic Cadillac Forum Discussion, 1964 deville...A/C not Blowing in Past Cadillac Vehicle Discussion; 1964have no power at blower motor. Does this have two blower resister and where does blower motor get it's power ...
  1. #1
    mjordanlmj's Avatar
    mjordanlmj is offline Cadillac Owners Member
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    1964 deville...A/C not Blowing

    1964have no power at blower motor. Does this have two blower resister and where does blower motor get it's power from?

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    Cady70's Avatar
    Cady70 is offline Cadillac Owners Member
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    Re: 1964 deville...A/C not Blowing

    I'd check the blower motor relay. It's on the passenger side of the firewall on a 70'. I'm not sure where it is on your 64'.

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    superjeep is offline Cadillac Owners Member
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    Re: 1964 deville...A/C not Blowing

    there is a time delay switch. its a white two prong switch on the blower housing under the hood by the pass side hinge. take the two screws out and with the key on manually switch with you finger. if the motor comes on chances are the master vacuum diaphragm is torn or cracked......they are not fun to replace. and you can bypass the switch but that master vac opens a food to the air box too so its best to do it right and replace it

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    i just fixed my climate control on my 64.....so i know a good amount about them now
    mjordanlmj likes this.

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    mjordanlmj's Avatar
    mjordanlmj is offline Cadillac Owners Member
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    Re: 1964 deville...A/C not Blowing

    Quote Originally Posted by superjeep View Post
    there is a time delay switch. its a white two prong switch on the blower housing under the hood by the pass side hinge. take the two screws out and with the key on manually switch with you finger. if the motor comes on chances are the master vacuum diaphragm is torn or cracked......they are not fun to replace. and you can bypass the switch but that master vac opens a food to the air box too so its best to do it right and replace it

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    i just fixed my climate control on my 64.....so i know a good amount about them now
    see the switch, but no wires to it The plug that goes to it is plugged into some kind of add on vacuum
    switch with several vacuum lines

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    superjeep is offline Cadillac Owners Member
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    Re: 1964 deville...A/C not Blowing

    Ahhhh so its been bypassed already. With the key on reach under that part and squeeze it. It should click and turn the motor on. If you have any questions message me your number and I can walk you through tests. Just put what was done and what you found on here in case anyone else is having the same issue

  7. #6
    FoxRodder's Avatar
    FoxRodder is offline Cadillac Owners Fanatic
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    Re: 1964 deville...A/C not Blowing

    Too busy with bigger fish to fry but my 68 does not blow any air in any position. Supposedly was at least blowing heat according to my buddy. All those vacuum lines give me the heebie jeebies lol

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    CadillacRichard is offline Cadillac Owners Member
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    Re: 1964 deville...A/C not Blowing

    There is a Boat switch that is vacuum controlled. It is on top of the heat exchange box. It must have power going to it, also if you depress the bottom of it it should click, then engage the fan. Make sure you have power at the switch and make sure you test the fan also with a hot lead.

  9. #8
    superjeep is offline Cadillac Owners Member
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    Re: 1964 deville...A/C not Blowing

    that boat switch isn't on a 64. the 64 uses a time delay switch that is activated by the master vacuum diaphragm

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    fox i have a 68 that i re did all the climate control on. so i know all about that too hahaha. if you depress the master vac switch with the 4 vac lines going to it with the key on does the blower motor kick on? if not pop the single wire off the motor and see if it gets 12 volts

  10. #9
    cadillacmike68's Avatar
    cadillacmike68 is offline Cadillac Owners Connoisseur
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    Re: 1964 deville...A/C not Blowing

    I recommend getting Cadillac Tim's Climate Control book for 1964. That was the first year of Climate Control in any car ever.

    Cadillac did some strange things back then to get automatic Climate Control, primarily using temperature sensitive resistors (where resistance varies with temperature) in series, coupled to a transducer to convert an electrical signal to a vacuum strength, and using that vacuum strength to regulate fan speed and amount of heat to blend. They also used a separate vacuum system to close up on a vacuum switch (referred to as the "Master Switch" also called "steamboat switch" by many), which is very susceptible to any vacuum leak. That master switch has to remain closed (vacuum pulling in (up) in the diaphragm) Constantly, or else the fan will shut off!

    They also used a "Time Delay relay" which is essentially more vacuum lines, to delay activation of the blower when changing modes.

    All of this can leak, I have experienced just about every type of vacuum line leak, and any one of them will shut the system down.

    Cadillac Did use a Master Switch in 1964. If it's not there, it has been bypassed, probably incorrectly. Closing the Master Switch Should energize the fan, IF it is otherwise good. You can also jump together the two wires going into the master switch, simulating a closed switch.

    If you don't already have, get the factory service manual. It should have a complete climate control vacuum diagram in it.

    Good luck. Once you get an understanding of the system, it's not hard to isolate the problem area.

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