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Thread: Blower speed

  1. #1
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    Blower speed

    When I use AC on automatic function the blower speed has recently become erratic. What do y'all think? TIA
    BW

  2. #2
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    Belt or exhaust drive? Does engine RPM or exhaust tone also change? What happens when AC switches off? First guess: PCM is not adapting or attempts to but is off the map.

  3. #3
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    Quote Originally Posted by 04 Quicksilver View Post
    When I use AC on automatic function the blower speed has recently become erratic. What do y'all think? TIA
    BW
    Supercharger blower or HVAC blower?

    TIA? transient ischemic attack?

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  4. #4
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    BCM on its way out?


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  5. #5
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    It's the HVAC blower. What's involved in investigating and replacing BCM?

  6. #6
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    2004 SB Ported Trilogy 48
    Has supporting mods and stuff
    Thanks to Marty O for his help in updating this car.

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  7. #7
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    Quote Originally Posted by RubberCtyRauder View Post
    Thank you, sir. Looks to be beyond my mechanical skills. Will get in touch with my technician.

  8. #8
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    Neil that used to work at Firestone opened a shop in Lenexa Kansas

    autopia llc http://www.autopiakc.com/
    The twins2.3 whipple/aluminatorVortech V-2 lots of goodies

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  9. #9
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    Quote Originally Posted by Turbov6Bryan View Post
    Neil that used to work at Firestone opened a shop in Lenexa Kansas

    autopia llc http://www.autopiakc.com/
    Thanks for the info.

  10. #10
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    Quote Originally Posted by MyBlackBeasts View Post
    Supercharger blower or HVAC blower?

    TIA? transient ischemic attack?
    haha. Thanks In Advance
    "Come to me, Superman! I defy you! Come and kneel before Zod! Zod! "

  11. #11
    Join Date
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    Problem(s) solved. BCM replaced; right front window stopped, window regulator replaced; intake manifold gasket replaced. Tech said module was a little rough but he did not have to remove any hoses. Parts $202, labor $315. I already had the gasket. Great customer service. The guy's a wizard!

  12. #12
    Join Date
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    I took the car out last week and tried to turn the A/C on and nothing happened; blower motor didn't come on at all; what could possibly be the problem? I have heard blower motor or resistor..

  13. #13
    Join Date
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    APPLE VALLEY,CA
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    It was probably your BCM (Blower Control Module). When they get really hot, the solder joints melt and the unit fails.
    My black is on its third, My silver is still on its original.
    I sent out my extra BCM ( I keep one on hand) to fastblackmerc. He will fix the solder joints so the new unit once installed,
    will not fail. Also check your fuse.

  14. #14
    Join Date
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    Just check the blower 2 wires. If it has power and ground and not working, then the blower motor needs replaced.
    if there is no power and ground then BCM or fuse
    The twins2.3 whipple/aluminatorVortech V-2 lots of goodies

    Current marauders
    04 DTR totaled JUST NOW starting to part out 7-21-2021 https://youtu.be/REUxjP1BVpg

    04 Silver Birch Dark Charcoal Hardtop Whipple Supercharger
    04 Silver Birch Dark Charcoal Hardtop V2 Supercharger
    04 Silver Birch Dark Charcoal Converted
    03 DBP Light Flint #122
    03 DBP Dark Charcoal #232
    03 Silver Birch 300b Light Flint Going to fix er up
    03 Black 300a
    04 Silver Birch Dark Charcoal moonroof in the works

    04 Heaton Swapped DTR
    Joe's Wrecked DTR rebuild thread

  15. #15
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    Thanks to Jim for repairing my original BCM which I will have for a spare.

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