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Urban Hermit · 06-04-2020, 12:01 PM

Mother Superior (Monaco Cayman 36) whistles -- screams, actually -- at 65 and above, seemingly in response to a crosswind. So shrill and loud it seems to be inside. Last trip home it seemed to be coming from the top left corner of the windshield or thereabouts. There are a couple of air horns up there. But on a short slab run today it came and then went and sounded like the right side. Coach mechanic has suggested it may be the mirrors. It did start on the last trip after I adjusted the orientation of the left pod on its stalk, but I didn't do anything to the right mirror. The only other long trip was from purchase home, about 720 miles and it wasn't evident then.

Anybody experience the same phenomenon? Anybody know the cause and cure?

Jim_HiTek · 06-04-2020, 12:15 PM

Many Class A owners have experienced the whistling and it turns out the vast majority of them find the cause to be missing water weep hole covers. These are little plastic caps that are press fit into the water drain holes at the bottoms of the driver's window (outside of course). Owners can be fooled because the whistling doesn't often seem to be coming from the drivers window area.

Urban Hermit · 06-04-2020, 03:16 PM

Quote:

Originally Posted by Jim_HiTek

Many Class A owners have experienced the whistling and it turns out the vast majority of them find the cause to be missing water weep hole covers. These are little plastic caps that are press fit into the water drain holes at the bottoms of the driver's window (outside of course). Owners can be fooled because the whistling doesn't often seem to be coming from the drivers window area.

Thank you -- but if I plug the weep holes, will not rain water go where it should not? Does on my boat.

Jim_HiTek · 06-04-2020, 03:52 PM

The caps don't block water from weeping out.

Domo · 06-05-2020, 04:13 PM

To troubleshoot - you can use painter's tape and cover the various spots and go for a ride -

As suggested - the weep holes would be primes suspects...

Gary RVRoamer · 06-06-2020, 11:01 AM

I had a whistle problem with my '04 American Tradition. Some days howling bad, other days moderate or nothing.Took me several months to figure out that the position of the rooftop spotlight was the key factor. As long as I rotated the spotlight to face the rear, with its aerodynamic back-housing facing the headwind, there was no noise.

Dutch Star Don · 06-06-2020, 09:57 PM

I would take a real close look at your windshield, it was not uncommon on the Monacos for those windshields to move and pop out at one of the upper corners.

If it is the windshield, have it removed and GLUED back in. I know two Monaco owners personally, who have had the issue. One on a Diplomat and one on an HR Neptune.