Foul smell when starting 2017 Expedition

Discussion in '3rd Gen - 2007 - 2017' started by Stotadude, Oct 12, 2019 at 2:28 PM.

  1. Stotadude

    Stotadude Active Member

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    I have about 70K miles and I've noticed recently I get a nasty smell (like cow manure) when it first starts but then it dissipates. Any ideas what it is and how to get rid of it?
     
  2. bobmbx

    bobmbx Full Access Members

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    Inside or outside? Ventilation system on or off (heat or AC won't matter at start)?

    I'm guessing a moldy evaporator. Virtually every AC evaporator will produce that smell over time, and in cars its usually around late summer/early fall when people notice it the most. Sometimes the cure is as simple as letting the engine warm up and then blasting the heater at full for 10-15 minutes to kill the mold/mildew on the coils.
     
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  3. Dorzak

    Dorzak Full Access Members

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    Along with the burning off dust smell when you first run the heater.
     
  4. bobmbx

    bobmbx Full Access Members

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    Ah yes....the trusty dusty "whats on fire!" smell.
     
  5. Stotadude

    Stotadude Active Member

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    bobmbx

    I leave my heat/ac on auto at 70 most of the time. Are you saying to kick up the set temp as high as it will go and run it for 15 minutes?
     
  6. bobmbx

    bobmbx Full Access Members

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    Yep. ANd it doesn't hurt to run that hot air through as many air ducts as possible. Don't forget the rear unit, either.
     
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  7. Stotadude

    Stotadude Active Member

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    Ok, thanks. Will get on that tomorrow.
     
  8. Dorzak

    Dorzak Full Access Members

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    expect the smell to get worse for a bit then get better.
     
  9. Stotadude

    Stotadude Active Member

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    I ran my heat on high for 15 mins today and hope I am on the road to resolution. Thank you.
     
    Last edited: Oct 13, 2019 at 5:27 PM
  10. rjdelp7

    rjdelp7 2000 XLT

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    Lysol 'linen' spray works good. Remove the cabin filter and spray into hvac, air intake with the fan on high.
     
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