Originally Posted by skippy
does anyone have any idea what would cause an outside mirror on the drivers side rattle extremely loud to the point we can't talk to one another. this only happens when we increase our speed to 60 and above. the mirror has been replaced thinking this would handle the problem, no such luck. we have a winnebago 2012 sightseer. we have contacted winnebago and they have not had any other reports of this. any insight someone can give would be greatly appreciated.
Your question is a good one and asked too often.
If the entire head is shaking, as is often the case, the set screws are loose. If this applies to you it is fixable but will most likely occur again.
If you look at the arm under the mirror head you will see two small plastic plugs with a slot in each. These can be removed with a small screwdriver but care must be taken. They are fragile. Once removed you will be able to insert a alan wrench to tighten the screws. This should remove most of the shaking and rattles. Mirror alignment in the head is a good idea to check as Wayne mentioned and stuffing foam (backer rod might work) behind the mirror as pcurt23 mentioned is also a good way to go if the head is secure and tight.
Happy trails and many of them.