it's a mk3 mondy, the air con works fine(well used to),nice and cold, but now it only works on No1 on the switch/fan setting, turn it onto No2 3 or 4 and it goes off put it back onto No1 and it'll come back on. Any ideas?

heater relay resister??

I've found out that it is the air con resister costing about £15 / £20 but I'm away on holiday at the mo (and missing the air con in this heat lol) and dont have my manual with me, can anybody tell me excactly where the resister is located so I can fix it.

for the heater resistor, remove glovebox, look between the blower motor assembly & the heater assembly in the centre of the dash & you will see a white unit, unplug the white unit, remove the screw from the units edge, pull out the white unit & replace with the new one.