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Old 06-06-2020, 01:04 PM   #1
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Dash Air Vents not blowing

Hi everyone,

I'm new to your forum and have a 2002 Monaco, LaPalma on a Ford chassis and have been working to get the dash vents to function.

The air conditioning works but all of the air diverts to the default defroster position.

I'm looking for a diagram for the AC system to troubleshoot the vacuum controls system.

The AC unit says it's a Specific Systems unit on the evaporator. I'm not sure if this is the manufacturer or not.

Any help with how to troubleshoot and a wiring/ vacuum diagram would be great help.
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Old 06-06-2020, 01:20 PM   #2
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The most common cause of this is a vacuum leak in the small vacuum hose going from the vacuum reservoir to the actuator, there are a couple of other threads on this same topic going on at the moment. The small tubing / hose gets brittle with age and fails near the connection, or abrades and leaks midway down the line.
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Old 06-06-2020, 01:25 PM   #3
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I am not familiar with your system, but first thing to check is the vacuum to and from the control valve.
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Old 06-06-2020, 03:36 PM   #4
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As suggested, we checked for vacuum supply to the controller and found none. We found three vacuum lines that had been cut. A white one needed to be spliced back together again but then we had a black line and a red line (both plastic vacuum lines) that were cut and we couldn't figure out where their mating ends were.

We connected the black and red lines together and everything worked...go figure.
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Old 06-06-2020, 05:40 PM   #5
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I am glad you have it working again, any idea how / why the lines were cut?
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Old 06-06-2020, 07:23 PM   #6
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You know this is a new MH for use so not sure who worked this over in the past. Mostly glad it's working.
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