why does my Cadillac Escalade T1XX (2021-Present) AC only blow hot air?

Symptoms

• Air conditioning system fails to cool the cabin
• AC compressor may not engage
• "Check AC" warning light illuminated on the dashboard
• Unusual noises from the AC compressor or components
• Temperature control settings have no effect on air temperature

Diagnostic Steps

1. Scan for error codes using an OBD-II scanner to check for any AC-related faults.
2. Inspect the AC refrigerant level using a gauge to determine if it is low.
3. Check the AC compressor operation by looking for engagement when the AC is turned on.
4. Inspect the climate control settings for any electronic or mechanical malfunctions.
5. Examine the cabin air filter for clogs that could restrict airflow.
6. Test the blend door actuator operation to ensure proper air mixing between hot and cold air.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to prevent electrical hazards.

2. Recharge AC System

• Tools Needed: AC manifold gauge set, refrigerant (R-134a or R-1234yf depending on the system), safety goggles, gloves.
• If low refrigerant is detected, connect the AC manifold gauges to the high and low-pressure ports.
• Start the engine and turn the AC to maximum cooling.
• Add refrigerant to the low-pressure side until the system is at the proper pressure as indicated on the gauge.

3. Replace Cabin Air Filter

• Tools Needed: Screwdriver set.
• Locate the cabin air filter housing, usually found behind the glove box or under the dashboard.
• Remove the cover and take out the old cabin air filter.
• Install a new cabin air filter ensuring it is oriented correctly.

4. Inspect and Replace Blend Door Actuator

• Tools Needed: Socket set, trim removal tools.
• Remove the necessary trim panels to access the blend door actuator, usually located behind the dashboard.
• Disconnect the electrical connector and remove the actuator using the socket set.
• Install the new blend door actuator and reconnect the electrical connector.

5. Verify Compressor Functionality

• Tools Needed: Multimeter.
• Check the electrical connection to the AC compressor for voltage.
• If there is no voltage, trace back to the climate control module for faults.
• Replace the compressor if it is determined to be faulty.