All three of my Skoda Octavias from 2002 to date have a bit of an oddity when reversing; the heater starts to blow full chat no matter what the settings are. It then reverts to normal as soon as one drives forwards. Does anyone know why this is the case?

Closing the air intake so as not bringing in fumes.

5 minutes ago, Evolution13 said:

Closing the air intake so as not bringing in fumes.

I can understand closing the intake but blower going full speed??

I was assuming some error while the flaps closed.