![]() Thanks to all who contribute to this wonderful resource. I will try the probe scrubbing remedy next. While this is true for the majority of instances, it isn’t always the case. Based on what I've seen on this forum the next best guess is the resevoir being at fault or the probes. Common Causes of Coolant Light Illumination You may assume your coolant light may have come on because your coolant level is low or insufficient. Coolant levels are fine, I added approx 1 1/2 cups of distilled water on sunday due to sensor change so resevoir levels are good. Stops and does not reoccur during the rest of the trip (short duration). Once this happens, your engine has a high chance of getting self-destructed, which is not a desirable outcome. It indicates that the engine's temperature is rising above the optimum level. Wednesday evening after driving less than 4 miles the red blinking, beeping warning light goes on again. A coolant temperature warning light is one of the most critical warning lights, and the driver might deal with it. I did add some dielectric paste to the electrical connections before replacing. Coolant Light - 92 - 00 Lexus SC300 / SC400 - Lexus Owners Club of North America. This past sunday I changed the sensor and due to the tremendous advice on this site, using the quick replace method, everything went smoothly. Continually driving with a low coolant light on could cause severe damage to the internals of the engine. When the light comes on there may be no immediate danger that would require you to abandon your vehicle, but stopping your car is heavily recommended. I bought a new green sensor from vw dealer as this forum indicates its only a matter of time with the black sensor. If there is any light you should be attentive of it is the low coolant light for sure. A check of the coolant reservoir shows good levels but not all the way to the top. A low coolant level is caused by a leak, either in the reservoir or in the lines. So you might need a coolant change for that. ![]() A floating sensor in the coolant tank might trigger the warning light if the coolant ll drops. ![]() Only once did it flash after the car had been driven any distance, when it flashed/beeped then stopped. The top common reason for engine coolant light is that the coolant level is low. Car starts and runs normally.Ĭlimate - Eastern North Carolina, warm and humid.Ībout 2 months ago I started getting occasional flashing red temperature light after driving 2-4 miles. I wouldn't reccommend that with any newer engine, as everything made since the mid-90's seems to be hyper sensitive to overheating.2006 NB TDI, 60k miles, no modifications whatsoever. Incredibly, I didn't warp the heads or blow a HG in either case. Pulled over and found that my coolant return hose from the heater core had split, and I lost all the coolant.Īfter replacing the line and refilling the coolant, I went through some fun "burping" the system over the next couple weeks, including getting a huge air bubble stuck at my t-stat, causing another near-flatline of my temperature gauge. Looking out the front, there was no indication of what was happening, and by the time I noticed it, almost all the coolant had leaked/vaporized, so there was very little (white) smoke coming out the rear. I was driving to work, looked down because my heater was going cold, and noticed the temp gauge almost completely flatlined. In fact, they both happened to the same car of mine. Although if the temperature light is located on the radiator, a major hose failure could result in a low temp condition, but the huge amounts of steam, and trail of water behind you would be a good sign.Actually, either of the conditions I described can cause an under temperature reading. There is a seperate red light indicating the engine is overheating. THe blue light would only come back on when driving if the thermostat was stuck open, meaning the engine is too cold.
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