at the bottom of the coolant reservoir tank.
he radiator
Either coolant is low or the sensor in the reservoir is stuck with dirt. Clean the reservoir with soap and water
You need to check coolant temperature sensor and the water pump.
Answer low radiator light onProbably a bad low coolant level sensor. Sensor is located under the thermostat housing. Frequent problem with the Olds IntrigueAnswerThe sensor for this vehicle is built in to the coolant reservoir. So just swap out the sensor? Not on this vehicle; the sensor isn't sold as a separate unit (darn it). You must purchase a new coolant reservoir, which includes a built in sensor. Multiple internet suppliers sell these reservoirs for $70 (including shipping).
NOTE: this answer is describing the location of the engine coolant temperature sensor - NOT the coolant sensor in the reservoir that warns when the level gets too low.The coolant temperature sensor is located directly adjacent to the thermostat housing. The thermostat housing is what the upper radiator hose (toward the right side of the engine compartment) connects to. You do not have to replace the reservoir to replace this part, but leaky coolant reservoirs are a common problem on this model.
Normally in the coolant reservoir recovery tank. If you have the supercharged model it is located on the radiator beneath the filler cap and oil cooler lines.
coolant reservoir
Bottom of the coolant reservoir.
The engine coolant temperature sensor has nothing to do with the low coolant light. The low coolant sensor is mounted in the bottom of the overflow/filling reservoir by your washer fluid bottle. You will need to verify that the coolant overflow/fill bottle has coolant in it and if it does then the sensor is bad and will have to be replaced.
In the engine compartment, on the left side of the engine is the coolant reservoir. In the coolant reservoir, there is a sensor at the bottom of the reservoir. This sensor is supposed to let you know when you are low on coolant, but can also become defective, and give you a "false-positive" reading. The only way to know this is to check your coolant when the low coolant light comes on. If there is a significant decrease in coolant, you may have a problem in the cooling system , but if you don't, chances are the sensor isn't working. If the sensor is the problem, you can unplug it from the coolant reservoir, by unscrewing the two screws holding the reservoir to the car's inside firewall, then tilting the back of the coolant reservoir forward until you see wiring coming from the bottom of the reservoir, which is the plug for the low coolant sensor. Unplug the sensor, and the low coolant light won't come on anymore. However, you will now have to make sure you check your coolant level in the reservoir on a regular basis.
Follow the radiator hose to the block on the drivers side. It will be clamped to a hose connection where the t-stat is. Right next to that connection on the right is the PCM coolant temp sensor.
The coolant temp sensor is located directly under the EGR valve, just in back of the upper radiator hose connection on the engine. The sensor has 2 wires and uses a 14mm socket to replace