Is it reasonable for the rearview mirror to fold automatically in northeast weather?

Unreasonable, it may freeze, so use it with caution.

The automatic folding rearview mirror may freeze in winter. For example, if the temperature drops suddenly, not only the rearview mirror will freeze, but also parts such as wipers, tires and brakes may freeze.

If you want to avoid the automatic folding rearview mirror from being frozen, you can cover the rearview mirror with plastic bags in cold weather, which can greatly avoid the rearview mirror from being frozen. If the automatic folding rearview mirror freezes unexpectedly, warm water can be used to help melt the ice. Some cars can heat the rearview mirror by charging. Heating can melt the ice on the rearview mirror, or you can use a hair dryer to help melt it.

Be careful not to pour the frozen rearview mirror with hot water, because this operation may easily lead to lens explosion and paint damage. Once it is broken or damaged, it is necessary to replace it with a new rearview mirror, and it cannot be forcibly broken by external force after the rearview mirror is frozen, which will easily lead to the damage of the automobile rearview mirror.