70 DeVille Blower blows on low only
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The Classic Cadillac Forum Discussion, 70 DeVille Blower blows on low only in Past Cadillac Vehicle Discussion; Hello, I am new to the forum--- Just bought a 70 Coupe DeVille today. I am sure I will have ...
  1. #1
    Jeff R's Avatar
    Jeff R is offline Cadillac Owners Fanatic
    Automobile(s): 1970 Coupe De Ville//Cessna 172
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    May 2013
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    St. Louis
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    70 DeVille Blower blows on low only

    Hello,
    I am new to the forum--- Just bought a 70 Coupe DeVille today.

    I am sure I will have several questions to post here but my first question is about the a/c blower.
    It has the auto climate control. The a/c compresser kicks on and I get somewhat cold air. However the blower blows only on low.
    How do I check this to see where the problem is--- or for simplicity, can I just hot wire the blower on High for now? The windows don't work so I really need the a/c.
    Thanks to all.

    Jeff

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  3. #2
    smelvis is offline Cadillac Owners Fanatic
    Automobile(s): 1970 deville convertible
    Join Date
    Apr 2012
    Location
    Cumberland, RI
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    Hi Jeff,


    I have a 70 dv and she sat for a while. Had the same problem. The blower is always on low even if the system is off. The air system is purged and vented into the engine compartment. I couldn't get mine to blow hard and after checking the elec connections a buddy told me to slide the switch back and forth a thousand times and even had me spray WD 40 in there. He suggested that because over time the contacts corrode. It worked for me. Might be worth trying.

  4. #3
    Jeff R's Avatar
    Jeff R is offline Cadillac Owners Fanatic
    Automobile(s): 1970 Coupe De Ville//Cessna 172
    Join Date
    May 2013
    Location
    St. Louis
    Age
    44
    Posts
    138

    Re: 70 DeVille Blower blows on low only

    I'll try it, thanks

  5. #4
    klinebau is offline Cadillac Owners Member
    Automobile(s): 1970 Deville Convertible Red
    Join Date
    Jul 2012
    Posts
    75

    Re: 70 DeVille Blower blows on low only

    You should get a copy of the factory service manual (electronic copies can be found online for reasonable prices). There are few items that are needed in order for the blower to kick into high speed. There is a relay for the blower in the engine compartment on the firewall. Also, the power servo needs to receive the correct signal(s) from the switch in the dash panel. The resistors for the blower are in the power servo.

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