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If coolant full could be a bad sensor
The coolant level sensor is bad
I had this problem with my 106 and it turned out that the thermostat was broken.
The sensor in the reservoir is probably bad. It is located in the bottom of the reservoir and fairly easy to change.
The coolant light should be going out when the system is filled. The sensor itself or the float system is probably bad.
on info panel when warning shows just press reset on right side of instrument cluster amke sure your coolant tank is full if warning returns the sensor can be gummed up with engine sealent used by gm, replace sensoe or flush reserve tank with hose,drain it a fill with coolant
low coolent/anti-freeze, check the tank and make sure it is full, if not, fill it to the full line. if the light doesn't go away, i would take it some place and see if the thermostat is working correctly.
The coolant level is checked at the coolant tank in the passenger front corner of the engine compartment . The coolant level should be up to the cold mark when the engine is cold . The radiator should be full so its covering the top plate .
Remove the radiator cap and add it directly to the radiator. Then fill the overflow reservoir to the full mark.
try unpluging the sensor in the overflo bottle. it could be dirty, or no good
When someone say's "Check the coolant level" they simply mean to open the hood and look at that little white bottle on the passenger side fender to make sure that the bottle is full of coolant/water mixture. It has a line on it that say's "Full When Hot". If the light on the dash stays on and the bottle is full, shake the bottle, the float inside the bottle is stuck.
Your thermostat has nothing to do with your coolant light. Your thermostat, if bad, would make your van run extremely hot, or not heat up at all. Your coolant light is probably a bad sending unit or ground.