my Honda Pilot YF3 (2016-2022) blows hot air even when the AC is on, why?

Solution

1. Preparation

• Gather tools and necessary parts.
• Disconnect the vehicle's battery to ensure safety during repairs.
• Allow the engine to cool down before starting work.

2. Check and Recharge Refrigerant

• Tools Required: Refrigerant gauge, vacuum pump
• Connect the refrigerant gauge to the low-pressure port of the AC system.
• Read the pressure; if low, proceed to the next sub-step.
• Use a vacuum pump to evacuate the system for at least 30 minutes to remove moisture.
• Recharge the system with the appropriate refrigerant type (R-134a) as per manufacturer specifications, ensuring to fill to the recommended pressure.

3. Inspect and Replace the AC Compressor (if necessary)

• Tools Required: Socket set, torque wrench
• Remove the serpentine belt by loosening the tensioner.
• Disconnect electrical connectors from the AC compressor.
• Remove the mounting bolts holding the compressor in place.
• Install the new compressor by reversing the removal steps, ensuring all connections are secure.
• Torque the mounting bolts to the manufacturer's specified values.

4. Replace Cabin Air Filter (if necessary)

• Tools Required: None
• Open the glove compartment and remove it to access the filter compartment.
• Take out the old cabin air filter and check for dirt or blockages.
• Install a new cabin air filter, ensuring it is oriented correctly according to airflow direction.

5. Verify Blend Door Actuator Operation

• Tools Required: Multimeter (if necessary)
• Remove the dashboard or access panel to reach the blend door actuator.
• Check for proper function by applying power directly to the actuator to see if it moves.
• Replace the actuator if it does not operate correctly.