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You may or may not have a head gasket problem.
If you put the coolant in the overflow tank, then it may not have been drawn into the cooling system yet. When you add coolant, it needs to be added at the radiator cap (when the vehicle is cool) and it needs to be filled all the way up to the very top. Then the overflow tank needs to be about half full, or at the "Full Cold" mark, if you can see it. The coolant level sensor is actually in the radiator, just below the radiator cap.
This is all assuming that the coolant light you are referring to is the "Low Coolant" indicator. If you are referring to the indicator that says the engine is overheating, then that is a different issue. In either case, the sensors need to be checked before deciding if you have a head gasket problem.
Take Care, Greg
because your coolant level is too low. put some antifreeze in it......
Dexcool
I have this same problem and it seems I have a bad manifold gasket. I keep losing antifreeze. This is not a cheap fix (for me)...around $800-900 because it's apparently very labor intensive. You may want to get yours looked at to see if you have the same problem.
No If You Have A Chevy Venture Van Like I Do Just Shoot Your SelfA correct and useful answerAll modern cars require a coolant mixture of a specific antifreeze and water. In some warm climates the mixture is water and corrosion inhibitor's.YOU MUST add the correct mixture of water and antifreeze!
The 2003 Chevrolet Venture coolant capacity is four gallons. The coolant can be mixed 50 percent anti-freeze and 50 percent water.
Dexcool
for my 2000 Chevy Venture I use DexCool. It is the ONLY one recommended by GM.
bad coolant level sensor in either side or bottom of plasit coolant resivoir,
Blown head gasket.
Manual calls for DEX-COOL It actually depends on what type of coolant is in it now. If it's green, it's been traded out with normal coolant. If it's reddish, it still has DEX-COOL in it. NOTE: you should never mix the two types together. DEX-COOL and normal coolant can clog up the system if mixed together. Some places sell a type that is safe for either type of system, but i'd go with whichever is currently in your system, $5 for a gallon of regular coolant or $8 for DEX-COOL but it improves expectancy of your heating and cooling system (which the venture sure can use)
Was built with Dexcool. A lot of people switch to green.
It's been done already. The biggest problem with making it a marketable venture is limitations on battery life.