Rob499

I have a Fabia Se L Tsi and a few days ago the climate control started blowing cold air instead of warm - not good on a damp evening when keeping the mist off the inside of the windscreen is vital. My independent mechanic has used his diagnostic box and found that the temperature flap (is that the correct name?) is stuck open. He went to order the part but the dealer wanted to know the error code and now the diagnostics won't give the code the dealer wants. The motor is around £190 and the job is difficult to get at, I'm told. The motor is a special order so can't be returned if it's the wrong one. Does anyone have any advice to offer? Should I take the financial hit and go to the dealer? Or should I persist with the independent? Of course, the car is just a few weeks outside of the extended warranty. Many thanks, Rob