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All the blend doors work but no heat through the car/ AC cold air only

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TBARNETT

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Discussion starter · #1 ·
All i get out of the vents is cold air AC compressor runs the all the time even on floor with high heat. Rear calls for full AC on scanner and it was turned off. All the blend doors move passenger, driver, fresh air and all the positions work - defrost panel and floor. Antifreeze is full, heater core gets hot, replaced solar sun sensor replaced thermostat and just replaced the head unit yesterday for the climate control
 
Discussion starter · #3 ·
#6 ·
TBARNETT said:
2012
Click to expand...
This module/controller.

AUTOMATIC TRI-ZONE
The Automatic Temperature Control (ATC) Tri-Zone Heating, Ventilation and Air Conditioning (HVAC) system allows the driver and the front and rear seat passengers the ability to automatically or manually regulate air temperature for their individual zones. Primary control for the rear HVAC system is on the front A/C heater control. All controls are identified by International Standardization Organization (ISO) graphic symbols.
FRONT CONTROL PANEL
Image

The front ATC A/C heater control and integral computer (1) is located in the center of the instrument panel and contains:
  • a push button A/C ON/OFF control (2). An ISO Snowflake symbol appears in the Vacuum-Flourescent (VF) digital display (3) when the A/C system is in operation, whether under manual or AUTO mode.
  • a push button front window defogger control (4). An indicator lamp illuminates in the control when selected manually and an ISO symbol appears in the VF digital display when selected by AUTO mode .
  • four push button temperature controls (5 and 18) to select the front comfort temperatures from 15-31°C (60-88°F). Comfort temperatures for each zone are shown in the VF digital display. If the set temperatures are 15°C (60°F) and is adjusted lower, the A/C heater control will attempt to achieve the lowest temperature possible, but the display will show LO. If the set temperatures are 31°C (88°F) and is adjusted up, the A/C heater control will attempt to achieve the highest temperature possible, but the display will show HIGH. Temperatures can be displayed in either Celsius or Fahrenheit, which is selected from the overhead console.
  • a push button rear HVAC system control (6). ISO symbols appear in the VF digital display to indicated when the rear system is OFF or ON, whether under manual or AUTO mode.
  • a push button rear window defogger ON/OFF control (7). An indicator lamp illuminates in the control when selected. The indicator lamp illuminates in the control even with the HVAC system turned OFF.
  • a push button control that locks out the rear heater-A/C controls (8), allowing only the driver and front seat passenger control of the rear HVAC system. An indicator lamp illuminates in the control when selected.
  • a push button automatic mode control (9) to set the HVAC system to AUTO mode. AUTO appears in the VF digital display when the system is in AUTO mode.
  • two push button front heated seat controls (10 and 13). Each control has two indicator lamps that illuminate, depending on seat temperature selected.
  • a rotary control knob for fan speed selection and turning the HVAC system OFF (11).
  • a cab temperature sensor (12) is located in the center of the A/C heater control. The sensor detects thermal radiation emitted by the front seat occupants and their surroundings.
  • a push button mode control (14) to override the AUTO mode. An ISO mode symbol appears in the VF digital display to indicate the current mode setting when selected manually or by AUTO mode. AUTO mode provides variable air recirculation through a broad range of high temperature and humidity conditions.
  • a push button heated steering wheel switch (15). when equipped. An indicator lamp illuminates in the control when selected manually or automatically with remote start mode.
  • a push button air recirculation control (16). The Recirculation button contains an LED that illuminates when the recirculation function is manually activated. The ATC A/C heater control computer logic provides variable air recirculation through a broad range of temperature and humidity conditions.
  • a push button synchronize control (17) that automatically adjusts the temperature of the front passenger comfort zone to the drivers comfort zone temperature. An LED illuminates in the SYNC button when the SYNC function is manually activated. SYNC appears in the VF digital display when the system is synchronized, whether under manual or AUTO mode.
  • illumination lamps for backlighting of the ATC A/C heater control.
  • computer logic that remembers the settings of the controls when the ignition is turned OFF, and retains those settings after a restart. If the system is OFF when the ignition is turned OFF, it will be OFF when the engine is restarted, etc.
The front ATC A/C heater control utilizes integrated circuitry and information carried on the Controller Area Network (CAN) bus to monitor many sensors and switch inputs throughout the vehicle. In response to these inputs, the internal circuitry and programming of the ATC A/C heater control allow it to control electronic functions and features of the ATC HVAC system.
Some of the inputs received by the front A/C heater control of the ATC system on the CAN bus are as follows:
  • A/C Clutch Engage
  • Ambient Air Temperature
  • A/C heater control backlight dimming
  • Engine Coolant Temperature
  • Engine Speed
  • Refrigerant Pressure
  • Electrical System Voltage
  • Vehicle Identification Number
  • Vehicle Odometer
  • Vehicle Speed
Some of the messages broadcast by the A/C heater control of the ATC HVAC system on the CAN bus are as follows:
  • A/C Request
  • EBL Status
  • Heated Seat Select
  • Heated Steering Wheel Select
The front A/C heater control for the ATC Tri Zone HVAC system is diagnosed using a scan tool. Prior to replacing an A/C heater control, check for any Diagnostic Trouble Codes (DTCs) related to the HVAC system and initiate the Actuator Calibration function to verify that the concern is not a HVAC system calibration issue .
The front A/C heater control cannot be repaired or adjusted and must be replaced if inoperative or damaged.
 
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TBARNETT
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