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Old 09-17-2018, 05:01 PM   #1
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Dash air blowing through defrost vents only

I have a new to me 2005 Winnebago Journey 32T. The dash a/c only blows air through the defrost vents only. Same thing in a/c, max a/c and even in heat setting. Is there a damper under the dash somewhere that could be stuck? A damper actuator that could be bad?
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Old 09-17-2018, 05:32 PM   #2
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Won't swear on your Journey, but my experience on other vehicles is it is a vacuum hose/leak/check valve that is the cause.
Good luck
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Old 09-17-2018, 05:42 PM   #3
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The small vacuum hose from the intake manifold to the heater control is probably bad or disconnected.

When there is no vacuum to the dash control, it defaults to defrost mode.

Someone just posted about the same issue. He found the hose disconnected under the dash and discovered it went into the middle of a multi hose connector under the dash.
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Old 09-17-2018, 09:17 PM   #4
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Thanks JPO1980 and twinboat for your responses. I went through the parts PDF tonight and found there is a vacuum pump and 2 or 3 servo's that operate dampers. I'm sure they are controlled by the heat and cool controller in the dash. I'll check the vacuum pump first. If that's working the dash will have to come apart [emoji53]
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Old 09-17-2018, 09:27 PM   #5
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The vacuum pump is on diesel chassis coaches , is your 32 footer diesel powered ?
Gas chassis use intake manifold vacuum.

Defrost is the default setting , actuators are spring loaded to set the entire system to defrost once there is no vacuum.
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Old 09-24-2018, 03:43 PM   #6
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Defrost is default position

On your dash is the rotary Heat/AC control. I had the exact same failure on mine. I had to replace the controller. Make sure you match replacement exactly to the one you have
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Old 09-25-2018, 07:15 PM   #7
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This problem has been fixed! In the Freightliner supplement that came with the motorhome I found a schematic of the vacuum operated dampers and control system. After familiarizing myself with the components I was able to locate under the small front hood the vacuum canister and vacuum pump. The rubber tubing was connected to the each of the components as they should be and then penetrated the firewall I assume to the dash controls. I then looked for the 12 volt terminals on the vacuum pump and determined only 1 wire was connected. I then found the 2nd wire and reconnected it to the spade terminal on the pump. Now the dash system actuators operate as they should and divert air to the appropriate diffusers depending on the control settings ie. heat, defrost, a/c, a/c max and vent.
Thanks to everyone who contributed information and helped me fix this. I really appreciate your help.
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