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Old 09-13-2021, 04:26 PM   #21
billr
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Default Re: Mixing orange and green antifreeze

Yes, there should be continuous flow through the reservoir; whether the engine is hot or cold. It comes in though a small (3/8" ID, 5/8" OD) hose that connects on the rear of the reservoir filler neck, just below the cap. You should see a steady stream coming in there.
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Old 09-14-2021, 04:36 PM   #22
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Default Re: Mixing orange and green antifreeze

Quote:
Originally Posted by Nursetom View Post
Should the coolant circulate in the overflow/reservoir (thanks google) when the engine first starts? I've got real low bubbling, even cold. I remember engines/radiators flowed coolant in and out of the reservoir by heat expansion/contraction, not actively pumping, but maybe these engines are different?
As Billr said above, there should always be flow when the engine is running.

If you are seeing bubbling, maybe you just don't have a good angle on the line. If you take the line off at the reservoir, you can then remove the cap (on a cold car obviously) and place the line in the reservoir. Start the car, then you can clearly see if the line has a steady flow or not.

Any restrictions can lead to cooling problems.
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Old 09-20-2021, 01:54 PM   #23
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Default Re: Mixing orange and green antifreeze

Well, it's time to flush your system out now.

Mixing green and orange coolant is a bad idea.

It's one of the things that is supposed to gum up the system.

It would have been much better to be a little low on coolant, or use water than to add green coolant.

As long as the car has enough to cool, being a little low is not a big deal.

Adding a little water is no big deal as long as you are aware of it, and won't see temperatures that fall below the new freezing point.

The coolant won't freeze, won't boil over, and you'll still have corrosion protection.

After adding water, the next time you are a little low, just add straight coolant and you'll be back to normal.

Now, there is nothing you can do with your green and orange mix except flush it out, and replace it all.
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Old 09-23-2021, 12:24 PM   #24
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Default Re: Mixing orange and green antifreeze

Cheap Tip:

Distilled water at the supermarket goes for less than $1.00 a gallon. Buy yourself a bunch of these and keep them in your garage. Then you can buy your favorite color coolant at full strength which is only a few dollars more than the 50/50 mix.

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Old 10-07-2021, 01:56 PM   #25
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Default Re: Mixing orange and green antifreeze

First, a little history...

Dexcool gets a bad reputation because it contained 2-EHA, a known plasticizer.
It softens plastic...

The problem was GM ALSO change the intake and head gaskets from a bi-metal to a plastic version, at the same time...

Took 3 years for GM to figure out what was going on...

Nearly all Dexcool of today should be free of 2-EHA...

Another good coolant is Zerex G-05, but I think that is being phased out, in favor of G-40...

https://www.valvoline.com/our-produc...uty/zerex-g-40

To me, the question is not "What Coolant Do I Use?",
but "How Often Do I Want To Change It?"

Ethylene Glycol - Green - 25-50,000 miles, 3-5 years
Dexcool - Orange color - 100,000 miles, 10 years
G-05 - Yellow - 100,000+, 10 years+
G-40 is pink -150,000, 15 years

Remember, always keep your coolant overflow tank filled to the "HOT" line, when the coolant is at ambient (room) temperature
Air is your enemy...

Add two Bars Leak Tablets to the radiator after antifreeze change.
These were put in at the factory, changing the antifreeze removed them.
Sold as ACDelco 10-108 also...
https://barsleaks.com/product/radiat...k-tablets-hdc/
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Old 10-07-2021, 03:38 PM   #26
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Default Re: Mixing orange and green antifreeze

Are you sure dexcool softens plastic? Radiator hoses and plastic coolant tanks as well as some radiators have plastic side tanks (Ions). If I'm not mistaken, early use of dexcool caused head gasket issues resulting in lawsuits in addition to GM models still using older radiators with pressure caps on them. The coolant overflow container that wasn't maintained allowed air into these radiators, increasing oxidation resulting in dexcool sludge.

My '03 L300 has always used dexcool with zero issues. Early GM head gaskets were paper that reacted to dexcool. The radiators with air exacerbated the sludge buildup. GM, I think, quietly replaced them with synthetic gasket materials and metal to eliminate reactions to dexcool. All GM coolng systems using the coolant container/pressure cap keeps just a small pocket of air at the top as the container is pressurized the same as the cooling system. This eliminated dexcool issues altogether otherwise dexcool would have been removed from the market with class action lawsuits of engine/radiator damage.
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