How to flush and fill cooling system?

Tiny
1013JESS
  • MEMBER
  • 1999 OLDSMOBILE AURORA
  • 155,000 MILES
Should thermostat be changed if over 5 years old? 4.0 Northstar engine.
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Tuesday, November 15th, 2011 AT 2:34 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

It is not required to replace the thermostat for this.
But it can be changed while flushing the cooling system so you will know that the component is new.

This vehicle uses 13 quarts of coolant.
Here is a helpful video on coolant drain and flush:

https://youtu.be/j8_MD76LbiQ

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

I have attached diagrams and instructions for your reference.

Please let me know if you have any questions.
Thank you.
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Monday, January 24th, 2022 AT 12:54 PM

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