Check coolant light comes on when starting the engine.

[davidmiller]

I started the car up yesterday morning, after a few seconds the light came up red and flashing and message saying check coolant in manual. After it warmed up a bit i turned engine off and started it again and light went out. I used the car for a couple of hours with no problems. This morning the light was back first thing. I let it idle a bit then started it up and no light.
Any ideas? The coolant is full.

 

[Bonni]

I started the car up yesterday morning, after a few seconds the light came up red and flashing and message saying check coolant in manual. After it warmed up a bit i turned engine off and started it again and light went out. I used the car for a couple of hours with no problems. This morning the light was back first thing. I let it idle a bit then started it up and no light.
Any ideas? The coolant is full.

Faulty sensor

 

[Burnerman]

Agreed - they are usually in the expansion tank.
Which vehicle is it?
John

 

[Old Salt]

Frost overnight! Is the anti freeze strength correct.