What the heck is this thing? - Printable Version

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What the heck is this thing? - pestes - 03-08-2024

So, twice in almost 6 years now, when starting off on a drive in the morning, an obnoxious noise has started coming from in front and left of the driver after a few minutes of driving. 

And both times, I pulled over, started poking around and unable to isolate it, turned off the coach and restarted it and the noise was gone.

It came on again yesterday, no driving involved this time, and continued through multiple stops and starts of the engine.

Tonight I was finally able to find where it was coming from.

What is this thing?

It's mounted underneath the coach, up a ways above the front 6 pack. Sorry for the bad headlamp lighting. You can just make out the steering column on the left side. It's mounted about opposite of where the ABS controller is mounted, but in the void above the 6 pack.

It almost looks like an aquarium air pump. Seems to have 12V going to it, and the only other thing appears to be a small air hose that leads off into the chassis somewhere.

And then, just like that - it stopped making noise again.

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RE: What the heck is this thing? - Richard - 03-08-2024

It’s a vacuum pump. Vacuum is used to actuate the doors in the dash HVAC plenum.

BTW, that pump is also used if you have vac pumps on your slide seals.

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