how to troubleshoot Honda Pilot YF3 (2016-2022) AC not blowing cold air?

Solution

1. Preparation

• Tools Needed: Safety glasses, gloves, OBD-II scanner, pressure gauge, multimeter.
• Safety Warnings: Disconnect the battery before performing electrical tests.

2. Check and Recharge Refrigerant

• Sub-steps:
  1. Attach the pressure gauge to the low-pressure service port of the AC system.
  2. Read the pressure; if it is below the manufacturer's specifications (usually around 30-40 psi), the system may need refrigerant.
  3. If low, connect a refrigerant canister to the low-pressure port and recharge the system according to the manufacturer’s guidelines (typically R-134a).
  4. Monitor the pressure while recharging to avoid overfilling.

3. Inspect and Replace AC Components

• Sub-steps:
  1. If the compressor is not engaging, check the AC relay by removing it and testing it with a multimeter (should show continuity when energized).
  2. If faulty, replace the AC relay with a new one.
  3. Inspect the compressor for any signs of leaks or damage. If the compressor is damaged, it will need to be replaced.
  4. Remove the old compressor (disconnect electrical connectors and refrigerant lines) and install a new one, ensuring all connections are secure.

4. Clean or Replace Cabin Air Filter

• Sub-steps:
  1. Locate the cabin air filter, usually found behind the glove compartment.
  2. Remove the old filter and inspect for dirt or blockages.
  3. Install a new filter if necessary, ensuring it is oriented correctly.