Coolant light

My coolant light keeps coming on after a few minutes of driving. My coolant reservior is full. The car is running at normal temp and has never overheated. Any ideas as to what is up.

The sensor may be bad on the coolant tank. Try swaping it out with a known good one, or replace it with a new one.

when this is the case will the light always come on. When I start the car it is always off. Within 5 two 15 min of driving it does not go off. If the light has been on and I start the car warm the light will come on.

yes it would,, remember when your running warm... your thermostat opens and then the water does get less.. change the sensor and youll be fine... look for leaks anywhere and also you might consider a pressure test

I have had sensors that fail and work only sometimes. they are odd sensors. pull out the sensor and see if the float moves freely.

Thanks Matt super helpful. I am 98% sure there are no leaks.

if the needle on the dash board doesn't go hot I would not be too concerned about the overhead warning light, although it means something, most likely the overflow resevour tank sensor. I certainly would scope that out, possibly a little low but not to fret over. The dash board gauge is what counts....if it stays within acceptable level than the engine should be OK...good luck...cliff

Originally Posted by Mr.///Matt

yes it would,, remember when your running warm... your thermostat opens and then the water does get less.. change the sensor and youll be fine... look for leaks anywhere and also you might consider a pressure test

mine was similar in that the stat would open and fine but going around turns would drop the sensor just low enough to make the coolant light come on. I just filled the coolant above the full line to solve that. But soon after the sensor broke. hope my old problem helps you fix your new one.

would a different light come on if the thermostat was not opening. I just drove it and it still comes up to temp but I am going on a little bit of a drive tomorrow and I don't want it to start overheating. We shall see what happens. Is there any way to tell if the thermostat is not working without going in and opening it up.

I drove it yesterday for about 300 miles in the mtns with the AC on and it never overheated at all. SO i am guessing that it has to be the sensor.