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The heater controller contains an ECU and a failure within, usually the rheostat (variable resister) can cause issues where the interior temperature is poorly regulated by the HVAC system, which is a basic form of climate control. This setup is used on the Smart Fortwo 451 Pure/Pulse/Passion/Brabus and limited editions. Some basic models will not have the air conditioning (A/C). My vehicle is a 2008
In this video I replace the heater controller with a second hand/used part. This involves removal of some dashboard trims and the radio.
Part number: A4519000901
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Disclaimer - Please be advised that my videos are not instructional and are merely footage of me, with many years of motor trade experience, carrying out vehicle repairs. Please conduct your own research, ensure you have the correct tools/necessary expertise and undertake your own due diligence before carrying out vehicle repairs. If in doubt, entrust an automotive technician.