Question about 2004 Ford F350

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My truck is stuck in the defrost mode and will not change to like the vents or to the floorbord vents how do i fix this it will still turn off if i put it in the off position

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The vents default to defrost as a safety precaution when there is no vacuum. The only things that I can think of that this could be are the vacuum motor or a vacuum leak. If its the vacuum motor you will also have 4X4 and vacuum assisted brake booster issues(unless you have a Hydro Boost system). If its a vacuum leak its possible that you have a cracked vacuum reservoir(located on the passenger side fender I believe), a disconnected vacuum line, or a damaged vacuum line.

Posted on Mar 25, 2011

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Posted on Jan 02, 2017

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Pull the control panel out of the dash and see if the mode control vacuum switch has a good vacuum source or the switch itself leaks vacuum. The mode control is what moves the doors that diverts the air flow around to the vents, defrost and floor.

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I have a 2003 Trailblazer and the dash vent is stuck on. When I try to switch it to the floor vents or the defrost it will start making a clicking noise and will not stop until I switch it back to the...


Mode Door Replacement

Removal Procedure

  1. Remove the I/P carrier. Refer to Instrument Panel (I/P) Carrier Replacement in Instrument Panel, Gages and Console.
  2. Remove the screws from the mode actuator.
  3. Remove the mode actuator.


  4. Click to Enlarge
  5. Remove screws in order to separate the defroster/mode outlet cover (2) from the HVAC module assembly (1).


  6. Click to Enlarge
  7. Remove the mode door (1) from the heater module.

Maybe the actuator needs to be replaced?

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It all depends on whether your truck is equipped with Automatic Climate Control or Manual HVAC. You could have a broken control head assembly a broken mode door cable, a failed electronic mode door actuator, a broken mode door, or a loose or broken wire or connector.

To put it simply, your mode doors are not swithching modes - the reason for this can vary depending on which system you have.

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There may be a problem in the climate control head. The most common problem with HVAC systems of that error is a broken vacuum line. Usually the feed line to the control panel is broken or disconnected from the engine and it is stuck in defrost mode as it's the default mode. If your stuck in the vent mode there may be a broken line at the climate control panel, a broken line to an actuator or a bad actuator.

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There's a good possibilty that you have a vacuum line off. When the heater controls lose vacuum, the heater will go into the defrost mode. There should be a small line, about 1/8 inch in diameter, that goes from the engine to the firewall. It's most likely on the passenger side.

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find the vacuum leak in the engine compartment vacuum hose from engine to firewall, and vacuum reservoir for hole (in engine comaprtment or wheel well

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