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Old 05-28-2023, 08:45 PM   #1
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99 dynasty dash ac blend doors location

My dash ac / heat blend doors are not switching when I move knob. I have 18 in. Of mercury ( vacume ) so my vacume should be enough but they won't move till I get to 25 on my hand pump. Where do I access my blend doors ?
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Old 05-28-2023, 09:24 PM   #2
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Do you have any info on the supplier of the dash A/C unit in your coach ?

With vacuum controls I'll assume your system is Evans/Tempcon .

Where are you taking your measurements ?

The distribution control in the dash may be plugged up , you have to check the vacuum at the output from the control to the vacuum actuators of the blend air doors.
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Old 05-28-2023, 10:29 PM   #3
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Sticky dash blend doors ?

Thanks skip, I removed the spaghetti line from vacume reservoir that goes inside to knob. It does have a venturi vacume system, which gets it down to bout 18. I read somewhere 10 to 14 should be plenty ? I'll look tomorrow for make of unit. I've checked all servos & lines for leaks all ok. Thru dash valve , & everything will work at 22 and up with my hand pump !
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Old 05-29-2023, 09:28 PM   #4
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I'll order the new YH600 dash valve by motorcraft tomorrow , thanks skip
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