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Old 08-14-2015, 10:48 PM   #1
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Intermittent dash blower failure

Hey all,

Every other drive or so, Evans system will not send airflow to the front blowers -- only the windshield (defrost) blowers. I believe this is a fail safe and there is a vacuum system problem, but beyond looking at the vacuum reservoir under the hood and not seeing anything grossly amiss, I have no idea what else to check.

Newmar wants me to see a tech, but that will take a while. And since we have had no actual dash A/C since we bought the rig in March (separate issue I've deferred until winter), now I have to resort to rigging fans all over the place to keep me from melting whilst driving in this 100F heat!

Any thoughts welcome, except the links to the Evans debugging diagnostic guide. I've gone about as far as I can with that (quick inspection of reservoir) before running out of imagination/expertise to know what they are saying to do. :-)

Thanks!
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Old 08-15-2015, 08:12 AM   #2
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There is a 12 volt vacuum pump under the front hood, it supplies the Evans unit vacuum. Make sure it's working.

Next test would require vacuum to the system and checking each door to make sure it moves on command.
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Old 08-17-2015, 12:11 AM   #3
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Thanks, John. Today I put key in ACC, blowers all went to windshield like usual. Went outside and pulled the hose off the nipple that goes into the Tempcon enclosed box.

Air pump fired up and started making more vacuum, so that's good. Reservoir seemed to be fine as well.

Put nipple back on (there was nothing more I could do unless I was prepared to remove the whole AC shroud thing), went inside, and the front blowers were engaged as requested!

So now I know one way to maybe get my blowers back in a pinch. But I still have no idea what the problem is. :-)
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