Dex cool gums up if it isn't routinely changed, which is what you are seeing as "mud". Dex cool is perfectly fine to use and is highly reccomended by GM, but requires changing annualy if not more frequently.
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05-31-2011
Dex cool gums up if it isn't routinely changed, which is what you are seeing as "mud". Dex cool is perfectly fine to use and is highly reccomended by GM, but requires changing annualy if not more frequently.
Originally Posted by W-Body Store
06-01-2011
Flush it with water.
Fill it 50/50 with dex.
Change it at the intervals recommended on the bottle, or before.
No need for an annual flush, though there's nothing wrong with it if you've got the money and time to burn.
Videos of how to do a coolant flush should be pretty readily available online... too lazy to find you some (sorry).
06-02-2011
The problem is that once the radiator is sludged its hard to get clean. I always ditch dexcool and go with traditional green coolant. It doesnt gum up and cause sludge. Just pers pref. Ive seen the amount of damage dexcool can cause when left un checked.
06-03-2011
Leaving something un-checked on your car, regardless, is begging for problems.
06-03-2011
Correct but unlike dexcool, traditional green coolant doesnt react to air and sludge up radiators and heater cores.
06-04-2011
I seem to remember that dexcool does not, in fact, react to air. Because dexcool does not stick to the sides of internals when you let it run low, rust quickly forms. The rust reacts with the Dexcool to cause sludge.
06-04-2011
OK. But you're still going to end up sludge. Switch to green and no sludge
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