you need
  • - battery,
  • - key,
  • - bucket.
Guide
1
Find the top end of the radiator drain valve or a valve for venting.
2
Put a bucket under the battery in order to avoid spilling of water, otherwise you can not just create a pool, but also flood the neighbors if the airlock will need to drain the water.
3
Turn the valve stem key a quarter turn.The key is to not remove the valve.Of course, if you have a valve on the side of the battery, get rid of the air pockets will be easier.
4
Wait until the end of the hiss, nor will the first drops of water and close the valve.