the ac fan switch has 5 position, off and 4 fan speeds. the 2 highest fan speeds no longer work but the lower 2 still do. Any thoughts on what the problem is? I have a 2011 subaru impreza. thanks, kj

Blower motor resistor is what actually regulates motor speeds - the blower motor speed selector ‘switches’ rarely fail.

Not sure i understand your comment. Are you saying that one should or should not suspect the problem is the blower motor resister? Does the resistor control all speeds or just the lower 2 speeds?

♠️**Blower motor resistor is what actually regulates motor speeds** ♠️ - the blower motor speed selector ‘switches’ rarely fail.