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Thread: Blower Motor constantly blowing

  1. #1
    Join Date
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    Blower Motor constantly blowing

    What would cause the blower motor to constantly blow out the defrost vents even with the ETAC off?


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  2. #2
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    Try to swap out the EATC with a spare or another one to see if it the problem presists. If the EATC is off it shouldn’t telling the blower to turn on. Troubleshoot, you can go to the boneyard and find one and and see what happens. Process of elimination and on the cheap.

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  3. #3
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    I may try that

    I had the BCM re-done by FBM at the same time I had my LCM done and thought that would fix it. Guess not!


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  4. #4
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    I believe default for eatc bad orings is defrost
    2004 SB Ported Trilogy 48
    Has supporting mods and stuff
    Thanks to Marty O for his help in updating this car.

    R.I.P.
    Rex "SC Cheesehead"

  5. #5
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    Quote Originally Posted by RubberCtyRauder View Post
    I believe default for eatc bad orings is defrost


    Good to know, maybe FBM will chime in and if it is I’ll just send it to him and get the LED upgrade at the same time.


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  6. #6
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    I'll bet $5 it the BCM. If it still blows with the controller in the off position the BCM is shorted out or more like fused together. Get a BCM you know works and swap them out. I can't stress enough the phrase "you know works" They can be a hassle to swap out only to find out the one you put in doesn't work either.

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  7. #7
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    Quote Originally Posted by Granddaddy Marq View Post
    I'll bet $5 it the BCM. If it still blows with the controller in the off position the BCM is shorted out or more like fused together. Get a BCM you know works and swap them out. I can't stress enough the phrase "you know works" They can be a hassle to swap out only to find out the one you put in doesn't work either.


    I may try that also, thanks.

    I don’t know what everyone’s issues are with saying the BCM is hard to get to. It takes me more time to get the tools out than it does to remove and install it.


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  8. #8
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    Try tapping the BCM.
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  9. #9
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    Quote Originally Posted by fastblackmerc View Post
    Try tapping the BCM.


    I will tomorrow when it’s light outside, if it doesn’t work I’ll try a few of the other suggestions and if those don’t work I guess I’ll be sending you another one to upgrade.


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  10. #10
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    Is it blowing at max speed or something lower?

    Also try unhooking the electrical connectors on the back of the EATC head unit. If the fan stops, you've found the problem. If it keeps going, it's likely the BMSC.
    The Blackbird
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  11. #11
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    When mine did that it was the BCM. Motorcraft, only 2 years old. Replaced with new MC and all is well 3 yrs later.

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