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winnietrey's avatar
winnietrey
Explorer
Aug 12, 2017

2000 E350, only defrost vents work

Thanks in advance for any help or thoughts.

Situation, AC works, heat works, but they will only blow through defrost vents, will not change to dash or floor vents.

Anyone have a similar issue? any solutions?
Class C

12 Replies

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  • T18skyguy's avatar
    T18skyguy
    Explorer
    Aug 12, 2017
    There is a problem with the vacuum delivery to the vents, or a problem with the servo's. When a problem like this happens, the system defaults to defrost. It's designed that way for safety(vision).
  • dmjenks52's avatar
    dmjenks52
    Explorer
    Aug 12, 2017
    My 2000 E450 does the same thing - have looked for vacuum leaks but nothing found yet.

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