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Old 04-25-2014, 02:42 PM   #1
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Help with Evans dash a/c vents

Getting ready for a trip and went to lot to bring the m/h to the house to clean up and get ready. After I cranked it up I turned the dash a/c on and air will not blow thru the vents, the fan came on but no air, the air will only come out of the very outside vents directed towards the side windows. No matter what position I put the controls there was no change in the direction of the air flow. I found the blue hose attached to the vacuum in front of the motorhome but didn't know what I was looking at. Where do I need to start looking for problem, could it be something simple like a fuse?

PS. I was up at lot yesterday making sure everything was ok and I cranked it up and turned the dash air on and it was ok, like magic today I turn it on and nothing.
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Old 04-25-2014, 04:14 PM   #2
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When you say nothing is coming out are you saying you don't hear the blower motor either. There are 2 parts you need to have air come out of vents is the blower motor working and then the vent doors to open to allow air to flow through. You could check and see if the blower motor is working then see if you have A/C coming out of the defroster vents by windshield. Which of these problems do you have?
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Old 04-25-2014, 05:07 PM   #3
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Quote:
Originally Posted by tom chelbana View Post
When you say nothing is coming out are you saying you don't hear the blower motor either. There are 2 parts you need to have air come out of vents is the blower motor working and then the vent doors to open to allow air to flow through. You could check and see if the blower motor is working then see if you have A/C coming out of the defroster vents by windshield. Which of these problems do you have?
The blower motor is working, and air is blowing out the vents by the windshield. I can't redirect the air to the other vents. I have 6 vents on the dash, the two vents at the very ends are the only ones that blow air, I "assume" those two vents are defrost vents.
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Old 04-25-2014, 05:20 PM   #4
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Your Evans HVAC is vacuum controlled. If it loses vacuum, it defaults to the defroster vents. You have a bad vacuum hose or a bad vacuum pump. I'd check the pump first, it usually is under the 'hood' in front. If it's working and pulling a vacuum, then you have a hose leaking or disconnected.
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Old 04-25-2014, 06:12 PM   #5
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Here is a diagram of your Evans system.
Trouble shooting diagrams., parts, controls.
Here is a typical vacuum harness for a dash control you may have ,select yours.
All these links can be found in QT's 1 & 2 and added info for Evans AC/Heater system.
Your vacuum hoses need to be checked for cracks or some loose from components of system.
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Old 04-25-2014, 06:28 PM   #6
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Somewhat of an update, I found the vacuum pump and did the best to verify the lines were secure on the pump and traced the other end the best I could and gave it a couple of little "love" taps for good measure. I started up the engine and moved the selector to a/c and air came out of the correct vents (yeah for me), I can't leave well enough alone so I selected some other positions and when it went out of vent/ac mode it would not come back on until I shut everything down and gave the pump another little "love" tap, it seems if I leave it in a vent/ac mode it will stay there even after I shut the mh down and start it back up. I "assume" I might have a problem with the vacuum pump, now if I can figure out how to get to this thing to change it I might have this problem resolved.
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Old 04-25-2014, 06:40 PM   #7
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Here is a trouble shooting guide that will show if the pump is faulty and wiring feeding the pump so you can trace its location.
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