'02 impala low-coolant light on but engine not hot?

Question:
I've had to add some water several times in the past six weeks to the overflow bottle. The low coolant lamp lights but the engine doesn't get hot (overheat)

Answers:

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First and simplest would be to replace the radiator cap. Sounds like it might be getting old and not holding pressure.

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The low coolant sensor is in the overflow bottle, hence the light is on but the engine is not overheating.

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Try to replace this low fluid with coolant and not just water. The straight water can freeze in the bottle cracking it and over time and refills will dilute the coolant in the motor/radiator.

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If you keep having to add coolant after the cap, you need to get the cooling system checked. It has to be going somewhere, lets hope a leaky hose, worst case a bad head gasket.

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The lamp is on for one reason:

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1) YOU ARE LOW ON COOLANT!!! You've had to add to the system which means you have a leak somewhere.

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2) You keep adding just water, which is a cardinal no-no!! Only add coolant at a 50-50 mix. Plain water will eventually kill your engine dead. You wouldn't add just water to your corn flakes. never add just water or just coolant to your coolant system.

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Take your car to a reputable mechanic and determine why your vehicle is loosing coolant and get it repaired.

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hthis cars have a habbit of airlocking just keep puting water in it when it gets low and it will be fine. unless you have cracked the head gasket. for this just check for water leaks around the head above the manafold and the smell of anafreeze.

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Sounds like you have a leak. You can pressure test the system to find where. If you cant do it yourself it should not cost a lot for a honest mechanic to do it for you.

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your sending unit is bad.change it.

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Check your water pump. Your water pump has 2 pilot holes just behind the pulley. If these holes are wet, your water pump is going bad. Sounds like you need to replace your water pump. Make sure you get the water-antifreeze mixture correct when you get your water pump changed. I had the same problem with my 02 GM. I replaced the water pump and have had NO problems since.
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