The GM recomend using GM Dex-Cool Red Coolant.
The matter of fact is that many consumers has filed out complaints againts GM Dex-Coll Reed Coolant.
http://www.consumeraffairs.com/news04/2006/08/gm_dexcool.htmlhttp://www.consumeraffairs.com/news04/2008/09/dexcool_settle02.htmlhttp://www.consumeraffairs.com/automotive/gm_dexcool.html
We replace it with:
ANY COLOR ANTIFREEZE
ALL MAKES ALL MODELS
of cars and light trucks
add to ANY color antifreeze
PRESTONE.
It's up to you. Ask before, but if you decide to change the type of coolant then:
If your intention is to add coolant only, then you need:
PRESTONE 50/50
PREDILUTED ANTIFREEZE/COOLANT
If your intention is to flush the RADIATOR (Cooling System), then you need:
Mix with
ANY COLOR ANTIFREEZE
ALL MAKES ALL MODELS
of cars and light trucks
add to ANY color antifrezze
PRESTONE
EXTENDED LIFE up to 150000/mile 5 year protection.
On the back you have to read directions:
Step 1 Drain. Step 2 Flush. Step 3 Fill.
Recommended to ad 30% volume distilled water to 70% volume Antifreeze. If you flush the system and rinse with water you must add only 30% water to the antifreeze. There is more water trapped inside the engine compartment, because the thermostat is closed. Make sure to have a coolant density tester. When you finish one of 5 balls must sink, that indicates that you reached 50/50 strength. That means 50% Prestone and 50% Water, which will provide to your car a -34F degree FREEZE-UP Protection , and +265F degree BOILOVER protection. Make sure to open bleeding valve to discharge air pockets from the cooling system. Add coolant.The next day,while engine is cold open the radiator cap, and test the strength of coolant. If it is not quite right, then siphon coolant from the radiator and add antifreeze, or distilled water as necessary.
Let the car to cool down overnight and start engine. The cooling system might be cold. Untwist the coolant bleeding nipple. If there will be a jet or stream of coolant, that means the water pump is working and is O.K. After replace the thermostat. If still your car overheats then it might be a bad cylinder head gasket.
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