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You have a coolant level sensor on the side of the coolant reservoir that sends a signal to the light. Sounds like yours either needs cleaned or changed.
mine was located at the end of the big hose coming out of the top of the radiator. follow the hose to the engine. next to that hose you will see a sensor next to the hose. thats the culpret. Some models have it on the radiator, engine side. same deal, unplug the sensor wire, unscrew the sensor and replace with new one. MAKE SURE you motor is cold and when you pull the sensor the coolant is going to come out so be set up and move fast and you`ll probably wont loose much coolant. keep rags or paper towels below the sensor to keep from getting on the engine and smelling.
I had the same problem with a '96 Ford Taurus SHO. There was a level sensor on the radiator overflow reservoir that failed. I could not locate a replacement anywhere in the country, in dealerships or junk yards. I sold the car shortly thereafter, which is too bad, I dearly loved that car. I would think you would be more lucky if this is your problem. Check the overflow bottle and sensor for a problem and proceed accordingly.
Hello: Yes, you are correct, the sensor is normally located on the passenger side of the radiator tank. You only have to drain the cooling system down below the sensor. On some models the level sensor is in the coolant overflow tank.
Hello: You didn't post what year/model car. If its 1996 or newer the coolant level sensor is located in the overflow tank. Sometimes you can tap on the tank near the sensor and it will work. Make sure the sensor is connected, not easy to get access to it. To replace the sensor you will have to replace the tank.
Bleed the air out of the coolant system,and add more coolant,to radiator,and reservoir,and make sure the cooling fans are coming on,if the low coolant light stays on,remove the low coolant light sensor,and clean it off,it is located on passengers side in the radiator,it has a wire clip you have to remove,and dont loose it,after cleaning it,put the clip back on the sensor,and push the sensor back in the hole.
Check your coolant level. When the coolant gets too low this light will come on. If there is plenty of coolant and the light is still on, you probably need to replace the coolant resivouir because the sensor has gone bad. The sensor is located on the coolant resivour and must be replaced as a whole. You can find one for about 60 bucks and is a easy fix. You can do it yourself. Just make sure you replace the coolant with correct Audi coolant.
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