my Cadillac Escalade T1XX (2021-Present) has a strange smell inside

Symptoms

• Unpleasant or musty smell inside the cabin
• Odor intensifies when the air conditioning or heater is turned on
• Possible presence of mold or mildew
• Increased humidity levels inside the vehicle
• Odor may resemble burning or chemical smells

Diagnostic Steps

1. Inspect the cabin air filter for dirt, debris, or mold.
2. Check the HVAC system for any blockages or leaks.
3. Verify if there are any visible signs of water intrusion inside the vehicle.
4. Scan for any trouble codes using an OBD-II scanner that might indicate HVAC issues.
5. Examine the drainage system for clogs, especially from the sunroof or air conditioning condensate drain.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Replace Cabin Air Filter

1. Locate the cabin air filter compartment, usually behind the glove box.
2. Remove the glove box by detaching any retaining clips or screws.
3. Take out the old cabin air filter and inspect it for dirt or mold.
4. Insert a new cabin air filter, ensuring it is oriented correctly as per the airflow direction marked on the filter.
5. Reattach the glove box securely.

3. Clean HVAC System

1. Use an HVAC cleaning spray designed for automotive use.
2. With the engine running, set the HVAC system to recirculate mode and the fan to high speed.
3. Insert the cleaning nozzle into the air intake area (located at the base of the windshield).
4. Spray the cleaner, allowing it to flow through the system for several minutes.
5. Turn off the engine and let the system dry with the fan still running.

4. Inspect and Clear Drainage System

1. Locate the drain tubes for the air conditioning system or sunroof.
2. Using a flexible wire or compressed air, clear any blockages from the drain tubes.
3. Ensure that water drains freely from the system to prevent moisture buildup inside the cabin.