my Alfa Romeo Giulia 952 (2016-Present) AC is blowing warm air, what is wrong?

Symptoms

• AC compressor does not engage
• Warm air blowing from the vents
• Unusual noises from the AC system
• Increase in cabin humidity
• Check engine light illuminated (if applicable)

Diagnostic Steps

1. Inspect the AC refrigerant levels using a pressure gauge.
2. Check for any visible leaks in the AC system.
3. Scan for diagnostic trouble codes (DTC) using an OBD-II scanner.
4. Verify the operation of the AC compressor and clutch engagement.
5. Inspect the cabin air filter for clogs or restrictions.
6. Examine the AC system fuses and relays for damage or failure.

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Check Refrigerant Level

• Tools Required: AC manifold gauge set.
• Connect the high and low-pressure gauges to the AC service ports.
• Check the refrigerant levels; they should be within the manufacturer's specifications.
• If low, proceed to recharge the system.

3. Recharge AC System

• Tools Required: Refrigerant can and manifold gauge set.
• Attach the refrigerant can to the low-pressure side of the AC manifold gauge.
• Open the valve slowly and allow the system to draw in refrigerant until proper levels are achieved.
• Monitor the pressure gauges to avoid overcharging.

4. Inspect and Replace AC Compressor (if necessary)

• Tools Required: Socket set, wrench set.
• Locate the AC compressor, typically found on the front of the engine.
• Check the electrical connections and wiring for damage.
• If the compressor is faulty, remove the old compressor by unbolting it and disconnecting the refrigerant lines.
• Install the new compressor and ensure all connections are secure.

5. Replace Cabin Air Filter

• Tools Required: None (mostly hand tools).
• Locate the cabin air filter compartment (usually behind the glove box).
• Remove the glove box to access the filter.
• Take out the old filter and install a new one, ensuring proper orientation for airflow.

6. Reconnect Battery and Test System

• Reconnect the battery.
• Start the engine and turn on the AC to the maximum setting.
• Monitor for cold air to confirm proper operation.