why does my Cadillac Escalade T1XX (2021-Present) AC blow warm air

Symptoms

• AC system produces warm air instead of cold
• Unusual noises when the AC is activated
• AC compressor not engaging
• Fog or moisture on the inside of the windshield
• Unpleasant odors from the vents
• "Check AC" warning light illuminated on the dashboard

Diagnostic Steps

1. Scan the vehicle's OBD-II system for any error codes related to the AC system.
2. Check the refrigerant level using a manifold gauge set to determine if it is low.
3. Inspect the AC compressor for any signs of damage or wear.
4. Test the AC control module and HVAC controls for proper operation.
5. Examine the cabin air filter for blockage or contamination.
6. Verify the operation of the AC condenser fan.

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent electrical shock.
• Ensure the vehicle is parked on a level surface and is secure.

2. Recharge Refrigerant

• Tools Required: Manifold gauge set, refrigerant (R-1234yf).
• Connect the refrigerant hoses from the manifold gauge set to the low-pressure and high-pressure ports on the AC system.
• Start the engine and activate the AC to the maximum setting.
• Follow the manufacturer's specifications to add refrigerant until the correct pressure is achieved (typically around 30-40 psi on the low side).
• Disconnect the manifold gauge set and replace the service caps.

3. Inspect and Replace AC Compressor

• Tools Required: Socket set, wrench set, AC compressor, refrigerant oil.
• Remove the drive belt by loosening the tensioner pulley.
• Disconnect the electrical connector and refrigerant lines from the AC compressor.
• Unbolt the compressor from the mounting brackets and remove it from the engine bay.
• Install the new compressor with the proper orientation and bolt specifications.
• Reattach refrigerant lines and electrical connectors.

4. Replace Cabin Air Filter

• Tools Required: None (may vary by model).
• Locate the cabin air filter housing, typically behind the glove box.
• Remove the glove box to access the filter.
• Take out the old cabin air filter and install the new one, ensuring proper airflow direction.

5. Test and Verify System Functionality

• Reconnect the battery.
• Start the engine and activate the AC system.
• Check the temperature of the air coming from the vents to ensure it is cold.
• Monitor for any unusual noises or leaks during operation.