and its freezing becuause it probably needs a evapotaor cover, and more than likely one of the new sensors (identified by being black or white.. if its white, u need to put a black one in) , possible thermal fuse/defrost heater
introducing hot air into a cold air blown environment is not the cure and will intensify your problem
there was NO modification to the water lever.. there was a kit introduced to replace the handle and repair the door moulding if it was broken (as doors are usually in excess of £100)
best to get it sorted rather than introduce warm air and cause problems!