Repairing A/C Blend Motor: Knocking Dash

Discussion in 'Fiesta ST Maintenance' started by DayJ, Aug 18, 2015.

  1. DayJ

    DayJ New Member

    A few people have posted issues about a knocking noise in the dash upon startup. Has anyone tried fixing this? I'm technically still under warranty, but I'm very protective over my FiST and don't want to take it to the dealer here in Phoenix. My guess is that it is the blend motor making the knocking noise, but I could be wrong. It stops about 8 seconds after start-up. The noise seems to be located in the dash near the ignition button/air vent.
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  3. Flaco1

    Flaco1 Member

    It not the motor but the gears in the actuator assembly. I just replaced the HAVC/Heater Blend Door Actuator in my FiST. The part # is YH-1935 AV1Z19E616. Bought it of ebay new Motorcraft in sealed bag for $47 dollars. You can repair it yourself if you don't mind working in the drivers side footwell upside down. Knee airbag needs to come out to get access. And the work area is small. Took me about 4 hours.
    RavynX and DayJ like this.
  4. RavynX

    RavynX Member

    My 2014 FiST started doing this yesterday at 36k miles. Thanks for the confirmation that this can be done without removing the dash. Did it take 4 hours because of trying to figure out how to take things apart or is it that tedious of a process?
  5. LotusZX3

    LotusZX3 Member

    My '14 just started doing this at 33k. :/
  6. RavynX

    RavynX Member

    The Motorcraft part suggested, YH-1935 (AV1Z-19E616-A), works fine but it's not an exact replacement as it feels like it sits higher than it should when screwed down.

    You will need to unbolt the driver's seat and either remove it or just slide it to the back seat area as you'll be on your back removing the knee-airbag.

    If I were to do this again it would take less than an hour but I definitely wanted to be cautious removing the knee-airbag. You'll want to make sure you disconnect it properly and not break any tabs removing it. Once you remove the knee-airbag it's up and to the right of the throttle pedal. Do yourself a favor by going to Harbor Freight and purchasing a $3 right-angle ratcheting driver as shown in the photos.

    20160717_160308.jpg 20160717_160436.jpg 20160717_160635.jpg 20160717_160648.jpg 20160717_162037.jpg 20160717_162048_001.jpg 20160717_162154.jpg 20160717_162213.jpg 20160717_172141.jpg 20160717_172314.jpg
  7. DayJ

    DayJ New Member

    I got the left one replaced last October by the dealership under warranty. Chapman Ford in Scottsdale did a great job.

    Yesterday, the right side started knocking upon startup. I'm at 50k, so this one is on me to repair.
  8. Steve@Tasca

    Steve@Tasca Fiesta ST Network Sponsor

    What are the engineering numbers on your old one? I can't quite make it out in the photo you posted.

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