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Front blower only operates in defroster mode

Tiny
WARMIL27
  • MEMBER
  • 2003 HONDA ODYSSEY
  • 3.7L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 165,000 MILES
Today, the front blower will only operate in the defrost mode. Temp control and fan speed work and control unit show displays when pressed by will not divert air to other vents. Any ideas?
Wednesday, February 18th, 2015 AT 6:26 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
The air flow vents, which direct air flow direction, are actuated by engine vacuum. My guess is there is a vacuum leak that is causing the system to stay in the default mode of defrost. What you need to do is check under the dash for damaged or disconnected vacuum hoses as well as checking the vacuum supply from the engine.

When checking, start the engine and listen for a hissing sound which could help you locate where the leak is located.
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Wednesday, February 18th, 2015 AT 7:57 PM

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