Coolant Flush Procedure...Why the Difference??

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Feb 25, 2006 | 02:18 AM

LIGHTNING

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Melting Slicks

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From: NJ

Coolant Flush Procedure...Why the Difference??

Noticed the procedure for performing a coolant flush is different in the 2000 C5 GM Shop Manual vs. the 2004 Manual. The '00 says you should use clean drinkable water.... '04 says deionized water. '00 says after filling system, run engine with pressure cap off for 30 seconds....'04 says run engine with cap on. '00 says to rev engine at from 2-3k rpm's, up & down for a few minutes....'04 says run the engine for 20 minutes. Why the differences??

Feb 25, 2006 | 04:43 AM

pewter99

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Feb 25, 2006 | 03:54 PM

FKING1

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Took my 00 to the Dealer who uses a chemical flush. I gave them distilled water to add to the anti freeze. Cost $100.

Fred

Feb 25, 2006 | 07:33 PM

LoneStarFRC

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Quote:

Originally Posted by FKING1

Took my 00 to the Dealer who uses a chemical flush. I gave them distilled water to add to the anti freeze. Cost $100.

Fred

I like distilled water also. No minerals and cheap too.

Feb 25, 2006 | 08:24 PM

LIGHTNING

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Melting Slicks

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From: NJ

Quote:

Originally Posted by LoneStarFRC

I like distilled water also. No minerals and cheap too.

What's the difference between distilled & deionized water?? Noticed the GM Service Manual says to use deionized water.

Last edited by LIGHTNING; Feb 27, 2006 at 12:17 AM.

Feb 25, 2006 | 10:17 PM

soggysailor

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From: Fresno CA

Is there an issue with the coolant type. I've had a few pros tell me to not use the red dexcool . They say it wants to gel or crust up in the system.

Feb 25, 2006 | 10:41 PM

W Muller

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Distilled water is distilled. Deionized water is run through an ion exchange deminerlizer. The end result is about the same. The dissolved solids and hardness are removed from the water, leaving it fairly pure.