Coolant light coming on when coolant is full (new sensor and no leaks) baffling me!

[Brasseyebaby]

Hi everyone,

So randomly a couple of weeks ago I got "coolant level low" light on. So I topped it up a little. It came on again so I added a little more to the point that it's on or over where it should be. The error keeps popping up but it will disappear after 10-20 seconds.

I've checked and there are no leaks and the coolant isn't going down at all. I've replaced the coolant sensor too and the message still pops up.

The car never gets hotter than the 90 mark and doesn't smell hot either so it's baffling me. Anyone had this issue?

It's an Astra J 2.0 CDTI 2013 165ps.

[Big Dave2]

All I see is a blank message. Are you typing in a certain font colour, or has your screen ink run out?

[Brasseyebaby]

Sorry not sure what happened there, the message was:

Hi everyone,

So randomly a couple of weeks ago I got "coolant level low" light on. So I topped it up a little. It came on again so I added a little more to the point that it's on or over where it should be. The error keeps popping up but it will disappear after 10-20 seconds.

I've checked and there are no leaks and the coolant isn't going down at all. I've replaced the coolant sensor too and the message still pops up.

The car never gets hotter than the 90 mark and doesn't smell hot either so it's baffling me. Anyone had this issue?

It's an Astra J 2.0 CDTI 2013 165ps.

[Jpbroad1970]

Think they are prone to header tanks , the float inside the tank breaks down.