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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-20-2003, 11:28 PM   #11
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Quote:
Originally Posted by 89BonnieSE89
Ya...if the car comes equipped with Dexcool it says very clearly on the reservior "Use Dexcool only"

Stick with the green coolant, I doubt it was meant to be mixed. Wasn't there a huge post about this beofre somewhere?
he switched from green to dexcool
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Old 05-21-2003, 12:14 AM   #12
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Hi

Dexcool must never be installed into a car that was not factory filled with it. Key cooling system components will be harmed. The solder joints in the rad and heater core..just to name a few...
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Old 05-21-2003, 12:30 AM   #13
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He speaks the truth. Back In high school we did a experiment and ran Dex in a 89 Suburban for the whole year. It ran fine for about 4 months then you see grey **** in the coolant. It neutralizes alot of the soldered parts in your cooling system. After this happend the cooling system just went down hill and we couldnt run the Burban again.
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Old 05-21-2003, 11:26 AM   #14
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Hi

If you still have Dexcool in, get it out NOW. You must flush thoroughly and completely, you entire system. I would suggest the Prestone Rad cleaner be used. But the key thng is..get it out Now..and flush, flush, flush.
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Old 05-21-2003, 11:35 AM   #15
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im on my way 2 part source to get some'a the green stuff, kinda sux cost me 100 bux last week 2 have it done
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Old 05-21-2003, 11:45 AM   #16
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Quote:
Originally Posted by lght1
Hi

Dexcool must never be installed into a car that was not factory filled with it. Key cooling system components will be harmed. The solder joints in the rad and heater core..just to name a few...
In the Tech Info section of this site, under Common Problems, there is a heading for Dexcool "Frequently Asked Questions:

Can DEXCOOL organic acid antifreeze be mixed with ethylene glycol
antifreeze?
It is ethylene glycol based antifreeze! The concern with mixing comes from
the fact that there are very different chemical inhibitor packages in use.
Most leading technologies will work very well when used as intended,
typically at 50% in good quality water. If the coolants become mixed with
DEXCOOL, however, one study showed a possible aluminum corrosion problem in
certain situations
How long will it last?
Uncontaminated, the engine manufacturers instruct that it may be kept in
service for 5 years or 150,000 miles in cars.
Does it protect aluminum?
Yes, even though it contains no silicate, the primary aluminum protector in
conventional antifreezes, published data shows that it protects aluminum.
What are the advantages of DEXCOOL compared to the previous GM 6043
factory-fill?
Compared to old-fashioned phosphate antifreeze, it may be more stable and
improve water pump life.

This is, in part, what the article contained. You may want to view the entire article in the Tech Info section. My '91 Olds originally came with the "green stuff" and I flushed and filled it with Dexcool about 3 years ago with no problems witht the cooling system at all.
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Old 05-21-2003, 12:53 PM   #17
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Hi

Dexcool can protect aluminum, as long as the system level is maintain. The coolant recovery bottle must never be allowed to run dry. Also, it seems that the stock rad cap should be replaced as GM seems to recommend these days.

In short, Dex is a high maintenance coolant with very demanding needs. The only thing I am concerned with it..even if the levels are kept..is its ability to degrade componenets in the system composed of nylon 6.6 .
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Old 05-21-2003, 01:24 PM   #18
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[quote="lght1"]Hi

Also, it seems that the stock rad cap should be replaced as GM seems to recommend these days.

I agree only 'cause mine looked pretty funky when I replaced the coolant

Quote:
Originally Posted by lght1
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The only thing I am concerned with it..even if the levels are kept..is its ability to degrade componenets in the system composed of nylon 6.6 .
I'm not familiar with nylon 6.6 What components contain this material?
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Old 05-21-2003, 06:06 PM   #19
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hi

Nylon 6.6 is often used as backing material for gaskets, and is also a component of some hoses.

When I get home, I'll try to post some links regarding other peoples issues concerning Dex.

You might try www.google.com and type in the name of the coolant. You'll be surprised of the "hits" you get.
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