Why does my low coolant light come on? I have plenty or radiator fluid in the system.

Bad sensor

I would say it is possible an overheated engine which is not coolling the transmission can trigger a lot of lights. Many transmissons are heated and coolled by a line which goes to the radiator of the engine cooling system.

possible two faults. the wire to the low level sensor is broken in the plastic which is an indication of no water to complete the circuit. and the wire to the temperature sender unit is loose on the unit.

Have you checked the coolant level in your radiator? GM puts a cooling unit in the bottom of the radiator, and that is connected to the tranny cooling system. Check for oil(tranny fluid) in your coolant of the radiator. Don't panic if you see it, just pull the radiator and have it fixed, or buy new radiator, then change all fluids in tranny and radiator.

replace the coolany levet sensor on the radiator tanks side
freeze plugs you have are 12 on all sides, front and back

There is a low coolant sensor down alongside the radiator. Either the wire came off or the sensor has failed. Other than the annoyance of the light being on if you keep an eye on the coolant level it will cause no harm.

bad low coolant switch or still low on coolant.

Engine Cooling The cooling system components are the:

• engine coolant temperature sensor (ECT sensor) (12A648)
• radiator (8005)
• degas bottle (8A080)
• radiator draincock (8115)
• water pump (8501)
• water temperature indicator sender unit (10884)
• water thermostat (8575)
• dual speed fan motor assembly

The water pump circulates the coolant.
The water thermostat:

• controls the engine coolant temperature.
• allows quicker engine warm-up.

The degas bottle:

• provides a location for fill.
• contains coolant expansion and system pressurization.
• provides air separation during operation.
• replenishes the engine coolant to the system.

The fan motor (8C607):

• operates only when the ignition switch is in the RUN position.
• will not operate with the switch in the OFF position.

The engine coolant flows:

• from the lower radiator hose (8286) to the water pump.
• from the water pump to the engine block and the cylinder heads.

A closed water thermostat returns the engine coolant to the water pump; an open water thermostat allows the engine coolant to flow to the radiator.
Engine coolant provides freeze protection, boil protection, cooling efficiency and corrosion protection to the engine and cooling components. In order to obtain these protections, the engine coolant must be maintained at the correct concentration and fluid level in the degas bottle.
When adding engine coolant, use a 50/50 mixture of clean, drinkable water and engine coolant.
To maintain the integrity of the coolant and the cooling system:

There is no reset button.When you fill it up it should just go out.What happens is the sensor is at the bottom of the fill bottle and all the dirt and junk is at the bottom.Sometimes the sensor is on the radiator.It is directly below filler neck of the radiator.Drain enough coolant to lower the level of the radiator and remove the metal retainer from the sensor.Remove the sensor and install a new one in.Refill the radiator.The light should be off.Make sure the vehicle is cooled down when working on the cooling system.

Why is it low? Leaking? The dumbest thing they sell is a 50/50 mix of antifreeze. You are getting 50% water and 50% coolant. Just buy a 100% antifreeze jug add it first and top it off with water. If the water is not low you may hve a bad coolant level sensor. It snaps into the radiator tank and is easy to replace when cold.

The coolant sensor located in the radiator is either gunked up or faulty if the fluid level stays ok.. The sensor is located on the engine side of the radiator about 3 inches from the top on the right side looking from behind the steering wheel