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To bleed the heater in a 2003 Toyota Corolla, you need to remove air from the cooling system by first running the engine with the heater set to full hot, then carefully opening the radiator cap to allow air to escape. Raising the front of the car with ramps can also help air move to the radiator for easier removal. Monitor the coolant level and top it off as needed after the process is complete.

Step-by-step bleeding process 
Prepare the vehicle: Park the car on a level surface with the engine completely cool. If possible, use ramps to elevate the front of the car to help trapped air rise to the radiator.

Start the engine and turn the heater on: With the engine running, turn the climate control to its highest heat setting and the fan to the highest speed. This will open the heater core, allowing air to be pushed out of the system.

Locate and remove the radiator cap: Slowly and carefully open the radiator cap while the engine is cool to release any pressure.

Add coolant: As the engine warms up and the coolant level drops, add the correct coolant mixture to the radiator to keep the system full. You can use a special bleeder funnel kit to make this easier and more visible, but it's not required.

Encourage air to escape: With the heater on, you can gently rev the engine to around \(3,000\) RPM to help push air pockets out. Watch for bubbles to escape from the radiator or funnel. Repeat this until no more bubbles are visible.

Finish the process: Shut off the engine. Check the coolant level one last time and top it off if necessary. Replace the radiator cap securely.

Test drive: Take the car for a short test drive and monitor the temperature gauge to ensure it's running at a normal level. Re-check the coolant level after the engine has cooled down completely.