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Check the coolant level if ok look on the tank on the side of the raid for a one wire connector unplug it to see if the light goes out if not ground the wire out and see if the light goes out
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If your coolant reservoir is full and the low coolant light is on, it is probably your coolant level sensor. If your low coolant light is on, and your reservoir is low....your are loosing coolant somewhere.
In most newer chevys, the coolant reservoir is part of the pressurized system. Rather than just holding overflow coolant and relying on the radiator pressure cap to draw from and expel to the reservoir, it is an active part of the cooling system. On these systems, there is a coolant level switch in the reservoir. This will activate if the level in the reservoir gets below a certain point. So it is possible to have a full radiator and still get a low coolant light. Be advised that as the reservoir ages and get stained, it is not uncommon for the low coolant sensor to give false indications of low coolant.
If the low coolant light is coming on, there could be a leak in the cooling system and the system may be very low. Sometimes if the cooling system is full and there are no leaks, the low coolant sensor might have a malfunction and turns on the low coolant light.
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..
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