why is my Ford Mustang S650 (2024-Present) heater blowing cold air only

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, screwdrivers, cooling system pressure tester, and a multimeter.
• Ensure the engine is cool and disconnect the battery.

2. Check Coolant Level

• Open the hood and locate the coolant reservoir.
• Inspect the coolant level; if low, fill it with the recommended coolant mixture (typically a 50/50 mix of water and antifreeze).
• Start the engine and run it to operating temperature to see if the heater begins to blow warm air.

3. Inspect and Repair Leaks

• Use a cooling system pressure tester to check for leaks in the radiator and hoses.
• If leaks are found, replace the damaged components (hoses, radiator, etc.).
• Refill the coolant system after repairs.

4. Thermostat Replacement (if faulty)

• Drain the coolant from the radiator.
• Remove the thermostat housing bolts and take off the housing.
• Replace the old thermostat with a new one, ensuring the correct orientation and sealing.
• Reinstall the housing and refill the coolant system.

5. Heater Core Inspection

• Remove the dashboard or access panel as necessary to reach the heater core.
• Check for blockages by feeling for hot spots on the heater core.
• If blocked, flush the heater core with a garden hose or replace it if damaged.

6. Blend Door Actuator Check

• Identify the blend door actuator, usually located near the heater box.
• Use a multimeter to test the actuator for proper voltage and operation.
• Replace the actuator if it is defective.