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Hello. Since you have Alldata, you can lookup and view as well but I included description and pix. The Heat/Cool is controlled by an electric actuator. It is common for them to fail or strip the gear. It is also possible the control switch is not sending the signal to the actuator but you must start at the actuator first. If you can get to it, unbolt it and let it hang. Work the temp control. The motor should spin one way and then the other. Be sure to look close at the gear on it as well. It could be stripped. This acuator controls ALL heat and cool air.