2002 Chevy Truck Red and Green Anti-Freeze

Tiny
DANNO719
  • MEMBER
  • 2002 CHEVROLET TRUCK
2002 Chevy Truck

I added about 2 qts. Of green anti-freeze to a Chevy truck that has dex-cool coolant in it. I read on a couple websites that mixing the two COULD be of some concern. Is this enough to warrant flushing the system? Or, should it be OK?
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Sunday, December 13th, 2009 AT 3:54 PM

1 Reply

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
No need to get a flush immediately. Mixing the conventional coolant with Dex-Cool simply degrades the service interval (approx. 150k miles down to 30k miles). You can run it like this for around 30k miles or 2 years, then you will want to drain and refill with proper Dex-Cool which will then last for 150k miles or around 5 years.
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Sunday, December 13th, 2009 AT 4:39 PM

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