This light is definitely a low coolant level light. The water in fuel light is orange, and the description Hawsey gives is exactly right for the low level light.
Now, to the cause.... Hmm, good one! These switches work by using the conductivity of the coolant to switch a transitor and bring the light on. Disconnecting the sensor (not sure of its location!) should bring the light on permanently. I had trouble with one in an old BX 14 - it came on when the car boiled over - it had been stolen and the relay for the cooling fan had been removed, it then stayed on, even when I had removed and cleaned the sensor - too much crud in the cooling system I think. I would first disconnect the sensor to see that the light comes on and stays on. Then remove the sensor and clean the probes, check the wiring etc.
I have a slight nagging worry about bubbles in the cooling system causing funny readings (head gasket troubles...???) - but I would have expected the symptoms to be the other way around if this was the case. Pointers for HG trouble - pressure in the cooling system when the engine is cold (eg in the morning), bubbles rising into the coolant, unexplained coolant loss, very quick pressurising of the coolant (eg within 30s - 1 min of engine start). I hope not!!
RichardW
Is it illogical? It must be Citroen....
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