WHen a/c is running car kicks fan into hi gear. What causes this

Asked by Feb 16, 2014 at 05:44 PM about the 2007 Volkswagen Jetta 2.5L

Question type: Maintenance & Repair

2 Answers

107,645

Your fan should run when ac is on and car is at an idle or at low speeds.

4,565

When running the A/C, there is an increased fan RPM (caused by a relay) to create more airflow through the radiator and A/C condenser. It's the airflow that leeches heat away from the A/C coolant and engine antifreeze and ensures the continued proper function of both systems.

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