There's a red light on in my car saying that my coolant level is low?

Question:
but the car has coolant in it and it's not running hot or anything could this be a sensor

Answers:

If my lights dim when my car's in idle, what can it be??

Just because you have coolant in the radiator does not mean it is circulating. You may have a thermostat stuck closed. If this is the case, no coolant is getting into the engine passages. The sensor is often located near the thermostat to monitor this passage.

Vauhall Vactra?

Check your thermostat. Also, check to see that your overflow reservoir is at the proper level.

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How do you remove lug nuts when they are stripped?

I believe you have to bring the car to be checked it is a good chance that it is a sensor that went out,

Just gotten a wheel alignment done but vehicle stills pull right. what could be wrong?

Good Luck,

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How often the wheels should be balanced of a car?

could be, can you see the coolant? if it is full might be sensor, if it is half full and you round a corner it sloshes below the sensor.

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