Cooling System


The most common formulation of antifreeze is green in color and uses ethylene glycol as a base with anti-corrosion additives mixed in. The ethylene glycol part of the formula provides crucial anti-freezing characteristics and the additives deliver the anti-rust and anti-corrosion capabilities. Beginning with 1995 models, most GM vehicles started coming from the factory filled with an extended-life antifreeze, trademarked as DEX-COOL®. Distinctively different in appearance, DEX-COOL®, and its aftermarket equivalents, is an orange/amber color. It still uses ethylene glycol as a base, but contains a different additive package than standard green-coloured antifreeze. This coolant is designed to protect cooling systems for up to 225,000 kilometres or five years. Other antifreeze formulations include silicate-free for Japanese cars and phosphate-free for European cars.


When properly mixed, antifreeze and water provide excellent anti-freeze, anti-boil and anticorrosive properties.

Maintenance Tips/Suggestions

Check your owner’s manual for antifreeze usage specifications. Antifreeze, when mixed at a 50/50 ratio with water, provides excellent anti-freeze, anti-boil, and anti-corrosive properties. In extremely cold environments, the ratio for standard ethylene glycol can go as high as 70% antifreeze, 30% water. With DEX-COOL®, the maximum ratio of antifreeze to water is 60/40. Although DEX-COOL® type antifreeze can be mixed with standard ethylene glycol antifreeze, DEX-COOL® loses its 5 yr./225,000 life. As such, it’s best not to mix antifreeze types unless absolutely necessary.

All coolants must be diluted with water at the proper ratios and should not be used full-strength. Full-strength antifreeze actually has a higherfreeze point (meaning it would be less effective) than when mixed with water. Generally, standard ethylene glycol type antifreeze should be changed every two years or 40,000 kilometres. Even though the coolant freeze protection may test OK with a hydrometer (freeze protection only drops with extreme dilution, not with age), the additives break down over time.

When changing coolant, it also presents an opportune time to replace bad cooling system hoses. Leaking, brittle, spongy, cracked, or rotted hoses should be replaced before new antifreeze is installed. Hose clamp connections should also be checked to ensure that they’re secure and free from leaks. If you decide to service your cooling system yourself, use extreme caution: Opening a hot radiator or coolant reservoir/overflow tank can cause severe burns. Be sure that both the engine and cooling system are cool before you begin any heating/cooling system maintenance or repairs. Because of lower hood profiles and cramped engine quarters, it’s also possible that your car may be equipped with an air bleed for the cooling system. Unless the cooling system is bled properly, air may stay trapped in the system and cause erratic temperatures, or in extreme cases, engine or cooling system damage. If you’re unsure about any aspect of cooling system service, don’t take a chance. Have your car looked at by a professional service technician.

What Colour Is Dexcool Coolant?

Who is Dex-cool? ” It’s true, antifreeze liquid is available in a lot of different colors. Among those are greens for Dex-Cool and yellow for Poly. There is a formula for every color, and mixing them won’t help.


Watch for signs of oil or rust

The color of healthy engine coolant is green (for ethylene glycol) or orange (for Dexcool). A rusty color indicates that the rust inhibitor in the coolant has broken down and it can no longer control rust and scale buildup. The system must be cleaned/flushed and a fresh 50/50 mix of coolant installed to restore integrity. A milky color indicates the presence of oil in the system. This is not good; it usually means that a head gasket, intake manifold, or transmission oil cooler is leaking oil or transmission fluid into the engine coolant. This is a deadly mix that will kill an engine or transmission in short order. Address the probleFrim immediately!

Dex-Cool Extended Life Coolant 50/50 Premix

Verified Purchase on January 12, 2020 in the United States of America The lifespan of DexCool is eight years. It seems as though this product has reached that stage of its development. I got -25 degrees Fahrenheit with a 60/40 mixture. The temperature should be -62 degrees Fahrenheit, according to the data in the tables. The next time I buy something, I’ll go to an auto parts store because their volume and turnover should be higher. This appears to be a NOS situation (New Old Stock). No such registration exists for UPC as DexCool.

  1. All of the bottles were shattered when they arrived, however the delivery box was in perfect condition.
  2. This is a challenge since I don’t want to make a huge mess.
  3. On August 2, 2020, a review was published in the United States of America.
  4. When I’m driving these automobiles, I’m solely using DEX-cool.
  5. Delivered right to your door for your convenience!
  6. Very good, with a lovely orange hue.
  7. You just have to repair it every 100,000 miles, so why take the chance of having a rusty head gasket or something else go wrong?!
  8. Exceptional service and delivery!
  9. General Motors original equipment antifreeze On January 4, 2020, the United States will conduct a review of this document.
  10. This is a product that I would suggest.
  11. on the 4th of March, 2018, in the United States Purchase has been verified Perfect for my car, just what I needed!

See also:   Water pump gasket sealer? (Best solution)

What exactly happens when these coolants are mixed?

The coolants chemically react and form a gel rather than a liquid. The coolant stops flowing through the system, clogs up coolant passageways and water jackets, radiators, and heater cores. The water pump overheats and fails due to a lack of lubricant in the coolant. Head gaskets blow, heads warp, and the engine suffers major damage.

What Does It Mean When Your Coolant Is Orange?

Describe the reason you use Antifreeze Orange. When antifreeze does not contain antifreeze made with orange or other chemical compounds, it is most likely produced using an organic technology based formula. Even though OAT antifreeze is designed to last a lot longer than IAT antifreeze, it’s always recommended to replace your orange coolant each 50,000 miles as part of your annual service check.

Dex-cool Contamination

The coolant in your cooling system is perhaps one of the most crucial components. In addition, it must be clean, non-corrosive, and non-conductive, as well as having freezing and boiling qualities that are adequate for the environment. The coolant should be changed every two years, according to industry standards. Some automobiles are being built with so-called “extended-life” coolants, which are designed to last longer than standard coolants. Dex-cool is one of the most popular extended life coolants on the market.

  1. These prolonged service intervals have proven to be nothing but a source of frustration for the consumer in the past.
  2. It appears that Dex-cool interacts with plastic sealing surfaces, resulting in leakage at the intake manifold gaskets, according to mounting evidence.
  3. This will not violate your warranty and will save you money in the long run.
  6. In order to prevent corrosion from occurring due to the absence of silicates (which are normally present in green antifreeze), a new corrosion inhibitor method was implemented.
  7. Unfortunately, the dex-cool has the potential to cause a fairly terrible failure.

If the residue is contained within the radiator, hoses, or recovery bottle, cleaning and removing the particles should be quite simple.

Certain instances have been reported where the orange mud solidifies and seems to expand or force the gasketed surfaces out of position, resulting in leaks.

As a result, they claim, the cooling systems enable evaporation, causing the Dex-cool to become destabilized, weaken, and lose its already inadequate protection, resulting in the muddiness of the water.

Neither of these hypotheses provides a comprehensive explanation of the situation, and these are not commonly accepted viewpoints.

They don’t have any.

They aren’t, in fact.

While the car is still under warranty, it is best to ignore the problem.

I believe it is this attitude that has resulted in the present class action lawsuit being brought against the company.

ethylene glycol is used in the production of 95 percent of all of these coolants, which are then blended with 50 percent water before being placed in a car or truck.

The variations in coolant brands are due to the use of compounds that improve the corrosion prevention qualities of the coolant.

More information about silicates may be found here.

OAT-formulated coolants provide “background” or reserve protection (similar to a vitamin), and as a result, they tend to respond more slowly to changes in the environment, as opposed to silicate-formulated coolants, which react more quickly to changes in the environment (works like an aspirin).

These chemicals may differ depending on the type of coolant being used.

The OAT-formulated coolant used in European automobiles has a small amount of low-level silicates added to it to give even more and faster protection.

More information about coolants, inhibitors, and silicates may be found in this section.

In other words, you should be taking care of your maintenance-free cooling equipment.

There are several inhibitors available. There are a lot of automobiles on the road. In only a few autos does corrosive gel build up in their cooling system, which causes overheating and leakage. The gel is thick, gooey, sticky, gritty, and muddy in appearance.


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