Larry, You are partial right and partial wrong. The light-sensor combination is sensitive to electrolyte/ion concentration. Pure distilled water would make the light come on. There exist some amount of antifreeze which contains ion that will allow current to flow between the two electrodes and the light goes out. Doubt that it takes much and if you have very hard water you might not even need the antifreeze. The design is for the indication that there is no fluid more than the kind of fluid but it does give some indication of antifreeze concentration when distilled water is used. It is possible if your coolant is right on this edge it could make the light act crazy, particuliarly if your sensor is in need of replacement. regards gary Date: Wed, 21 Aug 2002 08:44:09 -0500 From: Larry Alofs <lalofs@ENTERACT.COM> Subject: Re: Crazy Coolant Light Question > If the concentration of coolant is off it gets really > sensitive. I disagree common misconception
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