AUXILIARY HEAT. In an air-to-air heat pump system, the help that the heat pump gets is called auxiliary heat. The heat pump itself is the primary heat, and the auxiliary heat may be electric, oil, or gas. Electric auxiliary heat is the most popular. because it is easier to adapt a heat pump to an electric system.
We offer a service to rebuild and repair the electronic automatic temperature control (EATC) on 1996 and newer Ford Crown Victoria, F-150, F-250, F-350, Explorer, Expedition, and Excursion vehicles. This rebuild corrects a common issue with the EATC that causes air to blow out of the wrong vents and/or the defrost.ttp://circuitboardmedics.com/ford-ea... Circuit Board Medics shows how to initiate a diagnostic self-test of the Ford, Lincoln, and Mercury EATC modules. This procedure will help troubleshoot a faulty EATC or blend valve for the climate control system.
Sun Load Sensor. The (EATC) electronic automatic temperature control system uses the sun load and in-cabin temperature sensor inputs to adjust blower speed and improve passenger comfort. The sun load sensor contains a photo diode that's sensitive to sun light. Resistance in the sensor increases as sun load increases. If the sensor is covered with a dash cover or a window sticker, the control module will receive inaccurate information and make incorrect adjustments.