I have just had my Peugeot 306 XRDT serviced and the low level
coolant warning light keeps coming on intermittently. As well as
that the temperature of the engine will vary from just over 90, when
I am on the motorway to just above the 70 line when I ease off the
accelerator. Normally it will maintain the temperature just below
the 90 line. I had a new radiator a few years ago but did not have
any of these problems with it. I took the car back to the garage and
they said it was the thermostat which they replaced but this has
made no difference to the problem. The warning light did not come on
when it was at the garage!