Stating the obvious but you sound to have a coolant leak somewhere.
Very common with the 306. Hopefully you managed to spot the
overheating early and so only have the leak to fix.

Stuart
http://www.stuartdalby.co.uk/306.htm

--- In stuartspeugeot306club@..., mark sherwood
<marks_262@...> wrote:
>
> My 93 (L reg) 306 XRD was overheating the other day with some water
leaking, the heater also did not work. Car was shaking while drivng to
coold odwn and the fans where going for about 5 minutes after the
engine was switched off.
> The radiator has been refilled and air bubbles removed, hose and
connectors checked. Is there anything else that should be checked?
>
> Mark