Depends on vehicle some have to be jacked up and actually have bleed ******* for cooling system
When you have air in your cooling system, check for leaking gaskets. Most of the time the head gasket is leaking. and it is just a matter of time the whole gasket blows out. It will cost you because the engine needs revision, once the head gasket blows. Don't drive till a tech has checked your engine.
SOURCE: How do you get air pockets out of your cooling
Bleed the air out from the heater hose at the firewall. Open it slightly when engine is at operating temp. till all the air is out. You will lose some coolant also, so just top up the rad. after. Be careful, may get very hot.
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