what do I do if my Honda Accord's heater is blowing cold air constantly?

Solution

1. Preparation

• Gather tools: coolant, socket set, OBD-II scanner, pliers, and screwdrivers.
• Ensure the engine is cool and the vehicle is parked on a level surface.

2. Check Coolant Level

• Open the hood and locate the coolant reservoir.
• If the level is low, add the appropriate type of coolant to the reservoir.
• Start the engine and allow it to reach operating temperature, then check the level again.

3. Inspect Heater Core

• Locate the heater core hoses under the dashboard.
• Disconnect both hoses and check for flow using a garden hose; if no flow, the heater core may be clogged and require flushing or replacement.
• If coolant leaks are present, replace the heater core.

4. Thermostat Inspection

• Remove the thermostat housing using a socket set.
• Inspect the thermostat for proper operation; it should open at the specific temperature (usually around 180-195°F).
• If stuck closed, replace with a new thermostat.

5. Heater Control Valve Check

• Locate the heater control valve and inspect for proper function.
• If the valve is stuck closed or not operating, replace the heater control valve.

6. Cabin Air Filter Inspection

• Remove the cabin air filter cover, usually located behind the glove box.
• Inspect the filter for dirt or blockage; replace if necessary.