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Make sure engine is cold then do the following:

- Open radiator cap

- Start engine

- Once the thermostat opens , air bubbles should come out of the radiator neck

- Wait until air bubbles stops coming out of the neck

- Once the Air bubbles stops from coming out , fill radiator as neccessary

- Replace cap and test drive

- Repeat as neccessary

- Process can take long more than 10 minutes or more depending on how much air is trapped in the system.

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Q: How do you purge the cooling system for a 1999 Honda Civic?
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