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Old 07-13-2017, 07:06 PM   #1
Junior Member
National RV Owners Club
Join Date: Aug 2013
Location: Arkansas
Posts: 16
Dash ACís Vacuum Pump Not getting Power

Got a Evans Tempcon AC on my 99 Tradewinds and dash AC is defaulting to defrost vents because of no Vacuum. Checked the pump with external 12v and got the vent to work as they should. Then checked the wires to pump and getting no power. Checked all the fuses in panel next to driverís knee, and all good. Iím thinking itís something in the control panel? Any other suggestion? Rather than just buying a new one, I would like to check the control switch, but donít know how. I couldn't find any test procedures on the Evans web page...any help would be appreciated..thank in advance
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Old 07-13-2017, 08:47 PM   #2
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Location: Cincinnati
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The power for the vacuum pump is supplied by the ignition switch. The switch often energizes a relay that supplies power to multiple functions powered by the ignition. I'd search for that relay and test it.

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 07-14-2017, 09:56 PM   #3
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National RV Owners Club
Join Date: Aug 2013
Location: Arkansas
Posts: 16
Thanks for the input...so I found 1 relay under the dash, 8 in the fuse panel and 1 mounted on the outside fire wall, and all checked out good. Does anyone have an idea where this relay might be located.? I'm stumped.
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Old 07-17-2017, 09:46 AM   #4
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After numerous hours maneuvering my 6í 4Ē 250 lb body in and out a lot of tight spaces, I finally fixed the problem. So, I thought I would take a minute to wrap-up this thread, and hopefully save the next guy from going through the same pain. A recap: my AC dash air was defaulting to the defrost mode because of no vacuum. I check the pump with external 12 volts, gtg; check the relay, gtg; but discovered only one side of the relay was hot, ď# 85Ē, when you turn the AC on. I found the attached diagram, and saw the relay should have another hot side, ď# 30Ē, that is was fed directly from the battery with a 25 amp fuse. At this point I could have/thought about just cutting the wire, adding my own fuse and going directly to the battery; but, was worried about battery drain. So, I started tracing the #30 red wire through the firewall, under the dash (yea, I removed the dash), under the jacks/trans control panel (took that off) to the fuse box. There I discovered the red wire terminated via plug to a fuse panel. For some reason, that ďIgnitionĒ plug receptacle didnít work. I plugged it into another like receptacle, and all is good. I attached a photo of the fuse boxís plug ins, so, if this happens to you, check these plugs for power BEFORE you disassemble the entire front end of you motor home.
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Old 07-17-2017, 03:51 PM   #5
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Thanks for the tip. I have been trying to get the condensation from the AC to stop running out of the cover onto the generator. Poor workmanship on National's part.
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Old 07-17-2017, 04:36 PM   #6
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National RV Owners Club
Join Date: Aug 2013
Location: Arkansas
Posts: 16
I fixed mine from leaking by painting several coats of that flex steel stuff along the edge. It has stopped the leaking for now, but I'm not real confident it will hold.
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