After reaching the operation temperature the valve of heater will automatically let the coolant flow into the heater core which pushes out all air bubbles.
2006 silverado heater core flush.
Keep a look on the level of coolant in radiator.
The heater core is higher than radiator so you wont lose much coolant.
Stop the car from 15 to 30 minutes.
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To flush a heater core locate the heater core on the vehicle s firewall loosen the clamps and disconnect the heater hoses.
You would notice burping and bubbling action by the coolant frequently.
Usually there is a gurgle as the air comes out fill the hoses with coolant and clip back on the fittings fill the coolant tank and you should be good to go.
Place a container under the vehicle turn on the air compressor and allow the coolant and grime to drain into the container.
Next insert an airline into the outlet hose and seal the line with duct tape.
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Pull the hoses off and use a garden hose to flush the core.