Flushing and filling your radiator leaves a lot of room for air to get into the lines. When you fill the radiator with coolant, the level will show that it is full, but in reality there is air that has built up in the lines. Popping the air bubbles will free up that extra room. You will have more room for additional coolant, and this will help prevent the vehicle from overheating.
Open the hood to access the engine compartment. Locate the radiator in the front of the engine compartment.
Twist the radiator cap off by pushing it down and turning it counterclockwise. Observe the coolant level when you remove the cap.
Start the vehicle. Turn on the heater. The heater will help dissipate the air bubbles that accumulate in the coolant lines. Allow the vehicle to run for 15 minutes.
Observe the coolant level in the radiator. If you cannot see the coolant, then the level is low.
Pour in anti-freeze to top the coolant level off. The coolant in the radiator will bubble and pop. Keep pouring in coolant to the radiator till the level stays full.
Tighten the cap back on the radiator when the level stays full. Give the radiator a window of five minutes of running, after you top it off, to ensure all the air is bled out.
