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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...