Coolant temp/coolant level warning light comes on - engine cold and level is OK? on 2006 Volkswagen Jetta TDI

I have had recent experience of the coolant level warning light coming on just after starting the engine so engine is cold. Upon checking the coolant it is between the recommended levels and seems OK. If I stop the engine and restart it generally goes away. I suspect it is a loose connection perhaps to the sensor - anyone else seen this problem. I have had no issues with the cooling system in the past- the car has done about 135K and runs well.

by in Wake Island, HI on November 11, 2013
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1 answer 1 comment
ANSWER by , November 12, 2013
does it run hotter than normal?
COMMENT by , November 12, 2013
No it does not appear to run any hotter than usual