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Not sure on your car on my 172 heating packed up and it was the heater motor located on the drivers side under the windscreen wiper mechanism. It was a garage job.
Its Normal happens on most cars,
When you try to draw current from the battery by using more electricity ie blowers, rear screen demister, lights etc
The alternator tries to create more charge on the battery which makes the alternator harder to turn at idle, when you rev the car it...
I put a sports cat on my mk2 172 and the managment light came on. Had it plugged in twice to knock it off but it came on again. Spoke to charlie down @ prospeed and he told me that there is no way of knocking it off.
dan
Got a mk2 172 could anybody help as to why my little clock and air temp sensor only works every now and then. Could it be a loose connection or a bulb any help appreciated.
thanks dan.