Hi,

Does the raidiator get hot?  If not, it could be a bust thermostat that
is not allowing water to flow through it. Replace the thermostat.

If the raidiator does get hot then it must be a problem with the
electronic system; Temperature switch, Wiring etc.

I don't believe it would be a air pocket restricting coolant flow,  if
it was the engine would rise in temperature very quickly (<2 mins).  I
assume you've let air out of system using the bleed screws?

Richard

You need to check whether your electric cooling fans are working.
If on tick over they don't cut in and the engine overheats, then either the
fans or the sensor is faulty.
You can check the fans by bypassing the sensor to see if they operate.
Make sure you don't have any loose clothing etc near by.

If the fans work then the problem is with the sensor.
On a 406 they are only about £5 each and fairly easy to replace.
Not sure about the 306 though.
Hope this helps.

306hell wrote in message ...

Have you got aircon on this model? If so the fans should come on in series
(slow mode) as soon as the aircon is switched on irrespective of the engine
temp. If they don't work under this test ,suspect fuses, wiring and the
three relays used for switching between off,series and parallel.
If they work for the aircon then it could still be the above but also could
be the sensor. Not familar with the diesel but it could well be near the
water circulation thermostat housing.

Bob

which two large cooling fans are we talking about here?  I have 306.  The
fan on the switch on the fan needs checking first.

Bill