Hi, I know there are threads on this before, the heater only working on setting 4. And it has been said it is the heater resistor, my problem is I don't have a resistor on my heater motor. The space is there, but I haven't one. I have replaced the AMP assy and the radio/ac control facia, but this has made no difference. I have seen on here that they all have resistors, so where would mine be? I am a little frustrated!!