C5500 low coolant light on3/19/2024 6.5L Turbo Diesel - Tech Support - Troubleshooting - Performance.I don't know, but depleted Dexcool may also cause issues with the sensor (specific gravity changes), so maybe it's time for a coolant system service, if the mix is otherwise correct. now after a few minutes the low coolant light comes on and truck dies. I just changed my water pump thanks to all the info. That doesn't mean the system had less than 25%, but if you add water to the tank, you are diluting the mixture, and may cross that line. 1 (Edited) Hey guys, This is my first post. Less than about 25% Dexcool didn't show a level. Ordered a tank for 85 shipped to the house. Never was low on fluid in the tank hot or cold. Filled it and message went off for about a week then back on. I did some testing with the sensor using a scan tool to read the PCM coolant level indicator (on/off). Have been getting the low coolant message on and off for a few weeks. Anyway, after the head gasket replacement and a fill with 50/50 Dexcool the sensor and engine was happy. Turns out, the system had no Dexcool in it (water only, and I suspect the head gasket failure was related), and the sensor never saw the level. He did, but the low coolant indicator didn't stop. 99-06 chevy/gmc fixing low false low coolant light, by replacing overflow tank. An independent shop and the Chevy dealer both told the owner the sensor was bad, and the tank needed replacement. I ran across this while doing head gaskets on a 2001 Malibu about a month ago. The density of water is considerably different than Dexcool. At this time, the engine may be overheating. If you've added water to the tank recently, it may not sense the level correctly, and give the false indication of a failure. If the engine coolant temperature increases further, the indicator light/warning light illuminates in RED continuously.
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