I replaced my radiator earlier this year and wrestled with the bleed process. What I found that worked best was to:
1. Make sure coolant is topped off
2. Start vehicle and allow it to reach operating temperature. The heater does not need to be on. I believe the coolant circulates through the heater core regardless of what temperature you've set the climate control system to.
3. Open the coolant reservoir cap.
4. Have an assistant rev the engine at 3000 RPM for 30 seconds or until the temp gauge starts to rise past normal operating temp
5. Once your assistant lets off the gas pedal, the coolant level will suddenly go down. Top it off immediately.
6. Repeat the process as needed.
