Light came on dry, stayed on dry after starting the engine, light off with engine running and sensor submerged in a cup of water. So.I cleaned up the old original factory sensor and tested it. They CANNOT be working correctly if they do not illuminate the Low Coolant Light when dry as a bone. The problem with BOTH aftermarket coolant level sensors it that NEITHER one lights the LOW COOLANT light when plugged in dry (key on bulb check).UNLIKE the factory sensor which DOES turn the light on dry. These sensors simply close an internal switch when no liquid is present at the sensor on the switch (which is same effectively as shorting the connection) to illuminate the light. The bulb check is simply to short across the two terminals on the plug.if the low coolant light illuminates at key on bulb check and after starting stays on, the plug/harness is working correctly. And yes, I checked the wiring connector per the "Official" Carline 1994 Firebird service manual. Well guess what? The POS BWD brand doesn't work right EITHER. So I went down to O'Reilly's to get the battery charging cided to go ahead and get ANOTHER Low Coolant Sensor (Their brand is BWD.lifetime warranty.hrumpppp) after returning the AutoZone HQRP POS that didn't work. Well, let me calm down for a few.I'm so f.ing p.sed off right now, I could eat nails. I know there are all sorts of opinions about Dex that I don't want to get started here, but it makes me wonder if I should go back to the original green when I replace the sensor. Although when delivered new to the first owner in 1994 it had the green stuff in it (Dex didn't come out until 1996 model year), he changed it over to Dex-Cool for unknown reasons. I was wondering if it could be due to Dex-Cool. Let her cool down, light is back to normal.hence, I guess I need to replace it. The strange thing is if you shut down the car when at temp, the light comes on and stays on when re-started. Never comes on other than the bulb check when starting the car. The light operates normally when starting out cold and even when the car warms up to temperature. The malfunction on mine is a little different, but I just wanted to describe how it acts.I'm sure it needs to be replaced. EVERYTHING works as new, except, of course, the pesky LOW COOLANT lamp. If you'll look at my new member introduction, you can see the details about my new toy.
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