Need help with Blower Motor - 97 STS

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Electrical Technical Information Discussion, Need help with Blower Motor - 97 STS in Item Specific Cadillac Discussion; Couple of weeks ago, I noticed a thick smell inside my car from the vents. It seemed to be refrigerant ...
  1. #1
    eagle97 is offline Cadillac Owners Member
    Join Date
    Feb 2004

    Need help with Blower Motor - 97 STS

    Couple of weeks ago, I noticed a thick smell inside my car from the vents. It seemed to be refrigerant smell. For next couple of days, at times I noticed that the fan blowing speed will significantly decrease and even stop in some cases. Then it would come back to normal. With this change, I will again get the smell. In some cases, the RPM's were also affected.

    Well yesterday, the car stopped blowing air. Here are the symptoms:

    - No air even with A/C off. NO difference with HI/LO.
    - The Climate Control System works when AUTO is pressed. (changes vent direction and responds to change in temp)
    - It also seems that A/C compressor starts when AUTO is turned on.

    My initial guess is that the blower motor needs replacement. I need help on diagnosing the problem, e.g checking fuses, voltage, etc. And if it is the blower motor, then replacement procedures.

    The service manual is still packed away somewhere as I moved recently. Thanks for everybody's help. This forum is always great help.

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  3. #2
    Robteesit is offline Cadillac Owners Member
    Join Date
    Jul 2004

    Re: Need help with Blower Motor - 97 STS

    Hey eagle97 - Just went through what you are now experiencing ( see 96sts - blower moter install?) a few post down. The first thing I would do if I were you would be to check the connector. Make sure it is making good contact on both ends of the connector. The fuses are located under the hood on the drivers side. You will see the small fuse box - the fuse you are looking for in under the plastic cowling under those fuses. 50amp fuse thinking 3 or 4th one down on your left as you look at them. If the fuse is good, you want to check the power on the connector. Look at the terminal end it should be marked A-B-C. Point C should read battery voltage - Point A should measure 0 volts this is ground. Point B should be varying voltage depending on the blower setting. less than 4 volts is high speed, 4-9 volts is intermediated and 9 to 10 is low speed, 11-12 volts is off. If all that checks out you most likely will have to replace the blower motor/blower control module, one unit. This is a job no matter how you do it. For more info let me know, and good luck

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