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Someone added water to my DEX-COOL only 1996Chevrolet. 1500 suburban. What should I do. I only ran it for about 45 miles

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Was the water added to the coolant reservoir or into the radiator? If the coolant reservoir it's a simple matter to unbolt it, drain it, reinstall and refill to proper level. If water was added to the radiator, it's best to drain the coolingg system and refill with the proper 50/50 mix of Dexcool. Water in the radiator will not hurt anything in the short term, but will not provide adequate protection.

Posted on May 11, 2014

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Water/coolant mix should not be a problem but if you want the DEX- cool only the you'll have to do a radiator drain and flush. If you have never done a flush before I recommend having it done by a shop.

Posted on May 11, 2014

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Posted on Jan 02, 2017

  • 6982 Answers

SOURCE: Re: Dex-Cool in 1999 Lumina

The major reason for using dex-cool is that antifreeze is often neglected as a service item. If neglected, it becomes acidic over time which is particularly important with the use of aluminium in most major components which are served by antifreeze. Acid causes etching and premature failure of gaskets and permanent damage to blocks, heads and especially the radiator and heater core, which are not vert thick to begin with.
Since "normal" antifreeze acidifies faster than does dex-cool, mixing both together causes a change in breakdown rate...the more "normal" coolant added, the faster it breaks down.
Both coolants do not react chemically with each other and therefore retain the same ability to prevent boil over and freezing.
In reality, normal coolant can be used with little or no effect on components, provided that you change it every year. (that's where the EPA gets involved) They do not want people dumping this stuff into the ground, so they push for extended service intervals. Since dex cool has a longer service life, that's what they want you to use.
As far as how you chasnge the coolant, it is always a good idea to flush system during a change, regardless of antifreeze type. This removes solid particles which can plug radiator core. Radiators are much smaller than their older counterparts. Loss of even a small portion of cooling area can cause overheating. Engine running temps are also higher than older vehicles (heat=power output). Therefore most systems have a much smaller margin of error than before. What I find though is that regular flushing can also be bad for the system as the chems eat away at metal components in order to clean. I recommend regualr or dex cool antifreeze systems be flushed with water only, once a year, but retaining what you removed and filtering it through a coffee filter, using it during the year to "top off" the system. To retain effectiveness of coolant, use a hydrometer to check concentration, adding new coolant to bring reading to proper protection level.Then, every three years, do a complete chem flush and change entire batch. This keeps your system clean and the epa happy!

Posted on Mar 12, 2009

lebones337
  • 152 Answers

SOURCE: PCV VALVE

the pcv valve will be sticking out of the valve cover in either the front or back. and as for the dexcol, i would have it flushed really well and replaced with the reg green coolant. ive seen that stuff get bad quick.

Posted on Jan 02, 2009

  • 366 Answers

SOURCE: gm dex-cool vs prestone anti-freeze...

yes,your guy is right,a lot of gm cars have the int. gasket problem because of dex.

Posted on Feb 23, 2009

  • 1608 Answers

SOURCE: Low coolant light is still on after adding coolant.

What happens is the low coolant sensor is at the bottom of the fill bottle and all the dirt and grime get on it and it will not sense the coolant.You can usually tap on the bottle where the coolant sensor is and the light will go off or just replace it.It will either be on the bottom of the over flow bottle or in the radiator tank where the cap is.About 5 or 6 inches down.Hope this helps.Good luck.

Posted on Jan 12, 2010

  • 429 Answers

SOURCE: What is the difference between Dex-Cool and

Engineering terms here,
The DEX Cool has more "solids" in it (better heat transfer)
You can use either one, just don't mix them.

Posted on Feb 10, 2010

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1 Answer

Diagram for cooling system bleeder valve 02 deville


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Filling Procedure
Notice: Do not add cold water to the cooling system with the engine at or above operating temperature. Adding cold water causes rapid cooling, resulting in possible engine damage.
NOTICE: When adding coolant, it is important that you use GM Goodwrench DEX-COOL® or HAVOLINE® DEX-COOL® coolant. If Coolant other than DEX-COOL® or HAVOLINE® DEX-COOL® is added to the system the engine coolant will require change sooner; at 50 000 km (30,000 mi) or 24 months.
Notice: Do not use a solution stronger than 70 percent antifreeze. Pure antifreeze can freeze at -22°C (-8°F).
Important: This engine is not equipped with block drains, 2.5 L (2 qt) of residual coolant remains in the engine block.
Refill the cooling system. In order to ensure sufficient engine cooling, freezing and corrosion protection, maintain the protection level at -37°C (-34°F) or lower.
Start the engine.
Place the heater and A/C control in any A/C mode except Max and the temperature in the highest setting.
Allow the engine to continue idling until the lower radiator to water pump hose is hot.
Turn OFF the engine.
Allow the engine to cool to outside temperature. Ensure the coolant level in the surge tank is at the proper level (1).

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What kind of coolant do I use in my 98 pontiac grand prix?


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Coolant is low in my 1999 intrigue.. just bought it with 38,000 miles.. it says to put dex-cool in it.. should I?


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Good Evening, originally your vehicle came with dexcool antifreeze. However if you are not the original owner and they did work to it you may just want to check the color of the antifreeze to know which one to get. If it is green it is your standard antifreeze, if it is clear change it immediately because it is water and you really do not want it to freeze, if it is a orangish color it is dexcool. And if it is brown someone mixed dexcool and the standard antifreeze and I would recommend a flush and refill. There are varying thoughts on dexcool and a lawsuit going in california against it so you might look into that and make your own decision from there. Hope this helps.

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1 Answer

Which coolant does a 2003 envoy need?


The cooling system in your vehicle is filled with DEX-COOL engine coolant. This coolant is designed to remain in your vehicle for 5 years or 150,000 miles (240 000 km), whichever occurs first, if you add only DEX-COOL extended life coolant.

A 50/50 mixture of clean, drinkable water (if the water in your area is of poor quality, it is recommended you use distilled or de-ionized water) and DEX-COOL coolant will:
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  • Give boiling protection up to 265°F (129°C).
  • Protect against rust and corrosion.
  • Help keep the proper engine temperature.
  • Let the warning lights and gauges work as they should.
Hope this information helps

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1 Answer

My truck only overheats when the a/c is on


Start with the simple and replace the thermostat and also replace the coolant. The Dex-cool is only good for 150,00 miles or up to 5 years and any thing longer then that, the coolant crystallizes causing a flow restriction throughout your cooling system.
There is a TSB for thew servicing of coolant that needs to be done before replacing the Dex-cool. The cooling system needs to be flushed out to get the crystal deposit out of the system if there is any.
Gm uses Preston radiator flush to clean out the radiator and heater core of any deposit that will restrict the coolant from flowing throughout the system. Once the system has been flushed out, replace the thermostat and replace the Dex-cool with a 50/50 mix of water and Dex-cool for the best result in cooling. Too much water and the coolant will boil over and too much Dex- cool will jell up causing poor circulation.
Thank you for using fixya and good luck

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Re: Dex-Cool in 1999 Lumina


The major reason for using dex-cool is that antifreeze is often neglected as a service item. If neglected, it becomes acidic over time which is particularly important with the use of aluminium in most major components which are served by antifreeze. Acid causes etching and premature failure of gaskets and permanent damage to blocks, heads and especially the radiator and heater core, which are not vert thick to begin with.
Since "normal" antifreeze acidifies faster than does dex-cool, mixing both together causes a change in breakdown rate...the more "normal" coolant added, the faster it breaks down.
Both coolants do not react chemically with each other and therefore retain the same ability to prevent boil over and freezing.
In reality, normal coolant can be used with little or no effect on components, provided that you change it every year. (that's where the EPA gets involved) They do not want people dumping this stuff into the ground, so they push for extended service intervals. Since dex cool has a longer service life, that's what they want you to use.
As far as how you chasnge the coolant, it is always a good idea to flush system during a change, regardless of antifreeze type. This removes solid particles which can plug radiator core. Radiators are much smaller than their older counterparts. Loss of even a small portion of cooling area can cause overheating. Engine running temps are also higher than older vehicles (heat=power output). Therefore most systems have a much smaller margin of error than before. What I find though is that regular flushing can also be bad for the system as the chems eat away at metal components in order to clean. I recommend regualr or dex cool antifreeze systems be flushed with water only, once a year, but retaining what you removed and filtering it through a coffee filter, using it during the year to "top off" the system. To retain effectiveness of coolant, use a hydrometer to check concentration, adding new coolant to bring reading to proper protection level.Then, every three years, do a complete chem flush and change entire batch. This keeps your system clean and the epa happy!

Dec 17, 2008 | 1999 Chevrolet Lumina

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