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rooster

somewhere in the Ocooch

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Posted: 05/07/12 07:08am

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Has anyone had any problems with their vacuum pump? I had some work done on the alternator & A/C system, & now the vacuum pump dosen't work. I don't know if they are related as the coach is a pusher,(freightliner/cat) & the vacuum pump is up front on the firewall. So I have no control over cabin venting. Any ideas?

Tony & Cam
1999 Tradewinds 7371
2001 Cherokee

Mike Hohnstein

Germantown, Wi

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Posted: 05/07/12 07:29am

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Obviously you should return to the place that did the work related to loss of vacuum pump function. Could be rubber hose disconnected or knocked loose.

rgatijnet1

Florida

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Posted: 05/07/12 07:36am

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If it is an older coach, hoses deteriorate and sometimes just moving one during other work will cause it to crack/leak. I would guess that IF the vacuum pump is running, and creating vacuum, you should hear a leak hissing.

wolfe10

Texas

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Posted: 05/07/12 07:39am

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Find the pump-- probable locations are in the bay forward of the driver's front tire or in the very nose. No rocket science-- it runs on 12 VDC. The pressure switch may be internal or external, depending on which pump you have.

Could be a vacuum line that came off or is cracked (removing the vacuum line from the pump and sucking on it should hold a vacuum). Could be a blown fuse (no 12 VDC-- replace fuse). Could be a bad pressure switch or pump.

Once you fine it, troubleshooting is pretty easy.

Brett Wolfe
1997 Safari Sahara 3540
EX: 1993 Foretravel 36' U-240

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rooster

somewhere in the Ocooch

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Posted: 05/07/12 07:47am

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thanks for the replys. I know where the pump is, as I said, it's on the firewall in front. It just dosen't run. I looked for a fuse in line & in the fuse block, but it must be on a circuit with other things & everything else seems to work??
The coach is a National Tradewinds if that helps.