six months back the front passenger floor flooded due to a clogged windscreen drainage hole.
around the same time the heater fan stopped working on positions 1 2 and 3, tho' 4 was ok.
i assume the faults were related - checking the forum it looked like the resistors on the heater board had 'blown'
i did nothing to fix the heater fan, but just lately it has started to work intermittently again - when it does work it works on every position.
sometimes it comes on after i go over a bump
any idea what the problem might be and how to try to fix?