Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit/System Verification
2019 Chevrolet Trax Premier, AWDSECTION Circuit/System Verification
WARNING: This page is about a different car, the 2018 Chevrolet Trax and 2018 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Check for bulletins before proceeding.
- Ignition ON.
- Verify every applicable scan tool Switch parameter changes when pressing the appropriate switch on the A26 HVAC Controls.
- If any parameter does not change
Replace the A26 HVAC Controls.
- Go to next step: If all parameters change
- If any parameter does not change
- Verify the blower motor operates properly with the blower motor switch in each speed position.
- If the blower motor does not operate in each speed position
Refer to DTC B0193 .
- Go to next step: If the blower motor operates properly in each speed position
- If the blower motor does not operate in each speed position
- Verify the HVAC doors listed below move when pressing the appropriate switch.
- Driver Temperature
- Passenger Temperature
- Mode
- Recirculation
- If any HVAC door does not move
- Go to next step: If all HVAC doors move
- Install the J43600 Air Conditioning Service Center.
- Verify the high side pressure reading on the Air Conditioning Service Center is within 10% of the scan tool ECM A/C High Side Pressure Sensor parameter.
- If the reading is not within 10%
Refer to DTC P0532 or P0533 .
- Go to next step: If the reading is within 10%
- If the reading is not within 10%
- Verify the A/C High Side Pressure Sensor parameter is between 269 - 2929 kPa (39 - 425 PSI).
- If the reading is not between 269 - 2929 kPa (39 - 425 PSI)
- Go to next step: If the reading is between 269 - 2929 kPa (39 - 425 PSI)
- Verify the scan tool parameters listed below are within 10% of ambient temperature.
- Lower Left Duct Air Temperature Sensor
- Upper Left Duct Air Temperature Sensor
- Lower Right Duct Air Temperature Sensor
- Upper Right Duct Air Temperature Sensor
- A/C Evaporator Temperature Sensor
- If not within 10% of ambient temperature
Refer to DTC B0173, B0178, B0509, B0514 or B3933 .
- Go to next step: If within 10% of ambient temperature
- Verify the scan tool parameters listed below are within 10% of actual conditions.
- Passenger Compartment Humidity
- Passenger Compartment Humidity Sensor Temperature
- Passenger Compartment Windshield Temperature
- If not within 10% of actual conditions
Refer to DTC B018A, B048C, B048F, or B1395 .
- Go to next step: If within 10% of actual conditions
- Engine ON, A/C system ON.
- Verify cool air flows from the ducts with the temperature control in the coldest position.
- If the air is not cool
- Verify the Q2 A/C Compressor Clutch is engaged.
- If the Q2 A/C Compressor Clutch is not engaged, refer to Air Conditioning Compressor Malfunction .
- If the Q2 A/C Compressor Clutch is engaged, refer to Air Conditioning (A/C) System Performance Test .
- Go to next step: If the air is cool
- Verify warm air flows from the ducts with the temperature control in the warmest position.
- If the air is not warm
Refer to Heating Performance Diagnostic .
- Go to next step: If the air is warm
- If the air is not warm
- Engine OFF, ignition ON.
- Verify the Sunload parameter changes while covering the B10B Ambient Light/Sunload Sensor with a shop towel and changes when shining a bright light on it.
- If the Sunload parameter does not change
Refer to DTC B0163, B0183, or B1405 .
- Go to next step: If the Sunload parameter changes
- If the Sunload parameter does not change
- Verify the actual inside air temperature, using a thermometer, is less than 3°C (5°F) difference from the scan tool Inside Passenger Compartment Air Temp. Sensor parameter.
- If greater than a 3°C (5°F) difference
Refer to DTC B0163, B0183, or B1405 .
- Go to next step: If less than a 3°C (5°F) difference
- If greater than a 3°C (5°F) difference
- All OK.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.