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[leedsleedsleeds]

check coolant level light came on,checked bit under line so topped up,however light still on alltime is this faulty sensor or anything else thanks for help

[Entwood]

Either the float has stuck down, or the sender is FUBAR.

To check float, stick a finger in the header tank (H&S Warning .. NOT when HOT) and give it a wiggle see if it "rises" and "falls"

If the float is good, unplug the wire under the header tank and short it with a paperclip. If the warning goes the sender is FUBAR.

New header tank from VX about £35, or a second hand one..

[Andy B]

check coolant level light came on,checked bit under line so topped up,however light still on alltime is this faulty sensor or anything else thanks for help

Yes, you've a duff sensor. Cleaning out the bottle might put off the inevitable for a while,  but a new bottle is the only way.  about £35 .

[TheBoy]

A sticky float is a sign of poor coolant servicing...