screen demisting

[Colin McA]

I have an interesting problem.

My main heater works great as it should. However when set to demist the screen the drivers side isnt quite up to the job. The passenger side and centre is fine and very effective.

Any suggestions on why this is or how to clear the duct if ut is blocked.

Thanks
Colin

[Phil Nottingham]

Strange as the ducting is built inside the dash and is not liable to blocking at all from leaves etc. There may be remnants of broken screen or a mouse nest  hopefully uoccupied. How long has it been like this - mine is very powerful on both sides.

There are short flexis well being the dash and inaccessible which are glued securely on.  I suppose it could split/leak - on full speed fan on defrost the draft will be noticeable. If poor on demist only then its adjustment but unlikely as both would be surely affected