Question about 2002 Chevrolet Avalanche

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Low coolant light

My low coolant light comes on repeatedly; I have to add coolant (2 qts) every 30 - 45 days. I can find no leaks and my oil has been fine a regular oil changes and fill-ups. There is no overheating or other problems except the continued addition of coolant and the low coolant light. Help me out!

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Have you had the water system pressure tested it is a very simple test but the tool is a little pricey for one off use,maybe go to a radiator service centre and ask them to do test.Radiator cap may no longer be able to hold its rated pressure.It would appear that you are only losing coolant while driving and not at idle.

Posted on Oct 11, 2008

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Have the car put on a rack and look for a white powder, this will be the residue left by the coolant leak, if you find nothing then pressure test the system and look for a pressure drop after a few minutes, if you have a loss of pressure then the system is leaking, if there is no sign of the leak then it is going inside one of the cylinders.

Posted on Oct 11, 2008

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1.  Check to see if you have a leak.  Low oil levels can make the oil sensor light come one.  Check your oil level following the manufacturers recommended procedure or use the information listed here http://autorepair.about.com/od/regularmaintenance/a/checkoil.htm.  If you do not have a low oil level, but still suspect a leak, place a drip pan under the oil plug overnight.  If you have a leak, you'll see signs of it there.  Then take the vehicle to a trustworthy mechanic and let them trace the leak.  It is possible for your engine to only leak when it is hot, so make sure you get the engine nice and warm before you put the car away for the evening and place the drip pan under your vehicle.  Other signs of an oil leak are listed below as well as an "oily" exhaust that leaves it mark on your bumper or "blue smoke" as you drive/idle.
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Hope this helps!

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