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If the reservoir is full of coolant, and the light is on? It is very common for the low coolant sensor to stick. Try tapping on the reservoir, this will (sometimes) free up the float, turning out the light. Sometimes you have to tap pretty hard, don't break it, remember it's made of plastic :) Help this helps, TJ
the one thing that comes too mind is trapped air-when i do a radiator I always start up and warm engine so thermostat cycles a few times to make sure that you dont trap air in colling system. you did not say so but if you didnt, its really not a bad idea to change thermostat and gasket when digging into colling system. they are usaully fairly cheap.
If so the level sensor is in the reservoir. Sometimes the level gets stuck if the coolant gets low. Some gentle whacking of the reservoir with a rubber mallet is usually enough to get the light to turn out.
When the car is cold remove the radiator cap on the passenger side of the radiator. Add coolant until full.
a common cause for this is a stuck-closed thermostat, which would disallow coolant from circulating from the engine to the radiator. take the cap off the radiator and see if you can visualize the coolant circulating. if the coolant is just sitting there stagnating then that's probably the issue
The low coolant sensor should be located in the passenger side radiator tank, You need to take it out and clean the sludge off of it for it to work right. Or you can just unplug it and forget about it, the light will go out and it won't cause any problems.
Low coolant means just that, find out if the system is really low or the light is receiving a false signal from the low coolant sensor, just check the level in the coolant recovery tank and the make sure the radiator tank is full, if you are low on coolant then check out why, a leak is probable, most likely a water pump or hose related issue, and no a bad thermostat will not in itself turn on the low coolant light unless the engine boils over and the system becomes low. Remember never ever open a radiator cap on a hot engine, you would be surprised how many professional mechanics get burned this way, be careful..