![]() If it doesn't go out, either the coolant level is too low or there is a problem with the sensor system. then, on the dash, seeing a green light turn on, reminding me that it was "COLD". What is the low coolant level warning light for When you start the engine, the low coolant level light should come on for a second or two and then go out. I recall getting into a '61 Oldsmobile when it was 25 below zero, shivering on the vinyl seat that was as hard as a brick -and cold!- sitting there, freezing, turning the key to hear the starter slowly grinding away on the monstrous 391 cubic inch V-8 trying to get it to start. One cause of the BMW coolant light coming on and off is there is a leak in your BMW cooling. The fluid level is within the requirements (between low and high). The Manual says the fluid is either low or too high. ![]() When I start my 2004 TDI Jetta GLS and its cold outside, the temp light blinks after the engine has run a few run minutes and remains blinking. ![]() Make sure you use the correct coolant (Blue in the cooler) that is made for BMW cars or a brand that is recommended by BMW. Your car’s cooling system is an assortment of components and hoses, nearly all of which can develop leaks. 2004 Jetta TDI (old), 2006 Jetta TDI (current) Feb 8, 2009. Only in America: in the early 60s, "idiot lights" became quite the fashion. The right coolant is necessary to keep the engine from running hot and triggers the coolant sensor. If you're getting a "LOW COOLANT" light when starting, either it really is a bit low, or as Dennis mentioned you may really have a flaky sensor in the overflow tank. We recommend allowing your mechanic to replace the sensor as it could require removing the coolant tank. The most common reason for the coolant light to become illuminated is simply that the coolant level is too low. This may seem like a DIY job, but it is actually a very complex repair to tackle. So yes, it's somewhat akin to -and indicative of- "cold" and "hot" on other vehicles, but is strictly a volume situation. When the low coolant sensor goes bad you could have a perfectly operable tank and no leaks, just a bad sensor or light that will illuminate due to a bad reading. Engine temperature warning light bulbs will start flashing red when the coolant is failing to move through the system and keep the engine running smoothly. ![]() As it expands, coolant will flow into the reservoir, then be drawn back into the engine as it cools off and its volume is reduced. Ideally, it should never fall below the "MIN" mark nor ever rise above the "MAX" mark on the reservoir, but it WILL rise and fall as its temp rises and falls. Click on the VW dashboard icons below to learn what these symbols mean and what to do when they light up. If it’s red, pull off the road safelythen stop the engine and call for roadside assistance. At the risk of sounding too much like a know-it-all teacher (yeah, I was one, sorry).Īs far as I know, all cars these days (and most, since the 1960s) have coolant overflow reservoirs, as coolant will expand when it's heated up as the engine runs. The basic rules for warning lights are the same as for traffic lights: If it’s yellow, be cautious and check it out as soon as possible. ![]()
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