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The HVAC controller can now be pulled form the dash. Simply depress the locking tab and separate the plug. To get enough to room to remove the panel, it helps to have the gear selector in low.īefore you can pull the panel very far out, you will have to disconnect the head light switch. Simply dig your fingers into the groove around the face panel and pull back to release the clips. To remove the controller from the dash, begin by removing the dash surround. The relay can be swapped into a base that does not have one. The main difference between the different vehicles is the rear defrost control relay. The circuit board is the same for the pickup, Tahoe and Suburban. I was able to get one from a junkyard for a lot less. I tried replacing the defective transistor on my board but it did not restore proper operation.Ī complete r eplacement head unit is around $140 from. Some people have reported success in replacing faulty transistors to get their controllers working again. The mode damper control and temperature control is accomplished using transistors, diodes and resistors on a circuit board mounted behind the control knobs. The fan switch operates independently of the rest of the HVAC controls in the control head. The fan speed is controlled by a separate multi position switch. The controller sends a variable voltage signal to the actuator to command it to move to the appropriate position. The mode selector switch and the temperature control switch operate electric actuators on their respective mechanical dampers. Even though the appearance of the panel is similar, the 1994 and earlier use a different control head as well as the 1996 and later. The 1995 Chevrolet and GMC trucks are unique in their HVAC controls.
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