Where is the climate control PCB located on a GMC CK?
It is separately powered on Pin 1 from the dash light dimmer, and has no function in climate control, other than illumination. The climate control PCB is powered when the ignition switch is in the RUN position via Circuit #141. +12V comes in on Pin 5 in the upper left corner of the schematic.
What kind of climate controls does a GMC have?
You are currently viewing GMC.com (United States). Close this window to stay here or choose another country to see vehicles and services specific to your location. Your GMC is equipped with climate controls that allow you and your passengers to stay comfortable – whether you’re braving the heat of summer or the chill of winter.
What happens to the climate control unit when the blower is off?
If the Blower is off, the Recirc door defaults to the fresh air position. The Recirc door actuator is closed when a ground is applied at Pin 4 of the Climate Control PCB. When Pin 4 is open the actuator opens the door allowing fresh air to flow into the cabin.
What does switched + 12v do on a GMC CK?
The purpose of Switched +12V is to prevent the AC compressor from running when the blower is not running. Without the blower the evaporator and AC lines could ice up. It is a mystery why GM / AC Delco decided to disable all other functions such as Mode and Recirculation doors when the blower is not running.
It is separately powered on Pin 1 from the dash light dimmer, and has no function in climate control, other than illumination. The climate control PCB is powered when the ignition switch is in the RUN position via Circuit #141. +12V comes in on Pin 5 in the upper left corner of the schematic.
You are currently viewing GMC.com (United States). Close this window to stay here or choose another country to see vehicles and services specific to your location. Your GMC is equipped with climate controls that allow you and your passengers to stay comfortable – whether you’re braving the heat of summer or the chill of winter.
The purpose of Switched +12V is to prevent the AC compressor from running when the blower is not running. Without the blower the evaporator and AC lines could ice up. It is a mystery why GM / AC Delco decided to disable all other functions such as Mode and Recirculation doors when the blower is not running.
If the Blower is off, the Recirc door defaults to the fresh air position. The Recirc door actuator is closed when a ground is applied at Pin 4 of the Climate Control PCB. When Pin 4 is open the actuator opens the door allowing fresh air to flow into the cabin.
What do you call the climate control module?
Autocar LLC. Filter your results by entering your Year, Make, Model to ensure you find the parts that fit your vehicle. The climate control module, also known as a temperature, A/C or heater control module, adjusts your heating and air conditioning to keep your cabin heated and cooled.
What are the problems with a Delco climate control unit?
The most common problems with this vintage of AC Delco climate control systems are failure of ventilation door servos, and failures of the control unit. This document pertains to the control unit.