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Q: heat/cool system vent control on 2000 Chrysler 300M

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I have no heat.seems that the duct does not switch over from cool to heat.Is there something besides thermostat and heatercore that I can change to solve this problem?
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Most new cars use electric actuators to move the temperature and mode doors in the A/C - heater units. Your problem may be related to a malfunctioning temperature door actuator. The A/C control module of your 2000 Chrysler 300M may store fault codes related to the A/C system. retrieving these stored codes using a scan tool may help diagnose the issue you are having with your A/C system.
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