Alfa Romeo Giulia 952 (2016-Present) overheating warning light, what does it mean?

Symptoms

• Overheating warning light illuminated on the dashboard
• Engine temperature gauge reading higher than normal
• Steam or coolant leaking from under the hood
• Unusual engine noises (e.g., knocking or pinging)
• Decreased engine performance or power loss
• Smell of burning coolant or engine oil

Diagnostic Steps

1. Check the engine coolant level in the reservoir.
2. Inspect for visible coolant leaks under the vehicle and around the engine bay.
3. Verify the operation of the radiator fan by turning on the engine and watching for fan activation.
4. Scan the vehicle's OBD-II system for any error codes related to the cooling system.
5. Check the thermostat operation by feeling the upper radiator hose for temperature changes.
6. Inspect the water pump for proper operation and signs of wear or damage.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Wear safety gloves and goggles for protection.

2. Coolant Level Check

• Open the hood and locate the coolant reservoir.
• Check the coolant level; if low, top off with the manufacturer-recommended coolant.
• Secure the cap back on the reservoir.

3. Inspect and Repair Leaks

• Visually inspect hoses, clamps, and the radiator for any signs of leaks.
• Tighten any loose clamps and replace damaged hoses.
• If the radiator is leaking, it may need to be replaced.

4. Thermostat Replacement

• Remove the thermostat housing by unscrewing the bolts (check for torque specifications in the service manual).
• Remove the old thermostat and install a new one, ensuring the gasket is in place.
• Reattach the thermostat housing and torque the bolts to the manufacturer’s specifications.

5. Water Pump Inspection

• Remove any components obstructing access to the water pump (e.g., serpentine belt).
• Inspect the water pump for leaks around the shaft or housing.
• If defective, remove the water pump and install a new one, ensuring to replace the gasket.

6. Radiator Fan Check

• If the fan is not functioning, check the electrical connections and fuses.
• If the fan motor is faulty, replace it with a new one.