heater an air co not working on my piccaso used to work intermittingly would not work on start up but if switch was set to 1 2 3 or 4 and if i went over a speed bump the heater blower would burst in to life then wen engine turned off wouldnt work again un less hit bump then it stoped working all together had it to cittreon dealer they tell me its the ignition relay switch and will cost £300 but if its the relay would expect over things not to work ac switch does not light up when pressed demister switch next to it does light up and all dials are lit when cars lights are switched on any ideas

gothlord, December 2008

i might have the same problem and i've been told it could be the motor for the heater that's gone.

Ange, December 2008

At last - speed bumps have their uses! Can't see where they are coming from with the ignition relay switch idea (though they may be right!). Sounds to me like either a loose electrical connection or something physically stopping the fan from turning which is dislodged when you go over a bump and once running has enough momentum to overcome this resistance. Try and access the actual fan and see if it will spin freely by hand - if it will then it's probably an electrical fault, if it won't spin freely see what's stopping it!

Richard, December 2008