Richard,

Now I can get specific. If the noise is under the dish, see if the satellite is looking for a signal. That thing makes lots of noises if it loses a signal due to trees, heavy clouds, or just because it is acting up.

On both sides of the last bay you will hear the timy pumps that Jack and Roger mentioned. They cycle periodically. If you think that is what is doing it, turn off the switches at the level displays over the front windows in the TV control box.

If it is the aux air compressor you will hear that coming from beneath the floor somewhere under where the floor slide is. The bottom LH switch in the electric panel should kill that noise.

If it is the inverter fans, making lots of noise is a bad thing. My inverters are under the bed. Yours may be in the electric compartment. Regardless of where they are, if they are making the noise that needs to be takne care of pronto. A noisy inverter fan is one that is failing, and if it does quit heat can damage the inverter.

Other things that make noise in my coach are the refrigerator. It has a condensing coil fan located in the rear bottom near the compressor. If that is the noise that needs to be replaced also or your refrig is done working.

There are a lot of other fans and noise makers but they are assocated with stuff like the Webasto. The Webasto sounds like a jet plane when it lights off. The circulating pump sounds like a whine, and the various heat exchangers throughout the coach just make a lot of noise.