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1995 RD688S won't switch from cab heat to defrost. What should I look for?

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The rod fell off that opens and closes the door.

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Where's the rod/door located?

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Now that I think about it ,the lever moves a air cylinder which opens or closes the door. The air cylinder itself could of fell off.

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26 minutes ago, wilbur said:

Now that I think about it ,the lever moves a air cylinder which opens or closes the door. The air cylinder itself could of fell off.

Do you know what the access is to this air cylinder?

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Should be right under this panel.

MACK_RD688S_HeaterAC-Control_3737711_1_35282_1.jpg

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