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Why does the circulating air motor keep running after the heater is switched off?

This function protects the unit from possible overheating caused by heat build-up. The circulating air motor gives off the possible heat build-up into the vehicle interior during the after-run period.

Please note that this after-run occurs every time the Trumatic C is switched off, even after extremely short periods of operation. Remember: The fan after-run cannot be deactivated.