my Ford F-150 AC is not blowing cold air anymore, what's wrong?

Solution

1. Preparation

• Tools Required: OBD-II scanner, manifold gauge set, multimeter, socket set, safety goggles, gloves.
• Safety Warnings: Disconnect the battery before working on the electrical system and wear safety goggles when handling refrigerants.

2. Recharge Refrigerant

1. Connect the manifold gauge set to the low-pressure port of the AC system.
2. Check the pressure readings; if low, proceed to recharge.
3. Add the appropriate refrigerant (R-134a or R-1234yf, depending on the vehicle's model year) according to the manufacturer’s specifications.
4. Monitor pressure as you add refrigerant to avoid overcharging.

3. Replace AC Compressor (if necessary)

1. Disconnect the negative battery terminal.
2. Remove any components obstructing access to the AC compressor (e.g., air intake duct).
3. Disconnect electrical connectors from the AC compressor.
4. Remove the refrigerant lines connected to the compressor using a wrench.
5. Unbolt the compressor from its mounting bracket and remove it.
6. Install the new compressor by reversing the removal steps, ensuring all connections are secure.

4. Replace AC Relay (if necessary)

1. Locate the AC relay in the fuse box.
2. Remove the relay by pulling it straight out.
3. Insert the new relay in the same position.
4. Test the AC system to ensure proper operation.