Sorry for bringing up an old Thread. But mine has this also.
The coolant system is loosing water, its over heating. Rad/Cooling system bleed by garage (both valves open) last wed. Car overheated twiced driving home to wrk. To my horror, no water!
Thermostat changed, still running water noise, extremely minor leak on reservoir but still maintains extremmely good pressure within the system.
Removed dipstick, no water in oil (not milky etc), no loss of oil, hot air comes out of heater, no oil in coolant, so none of the obvious "tell-tail" signs of nackered Head Gasket. Though a fair bit of moisture from exhaust i believe.
I'm sooo confused.
Seems to be alot of air in the system, air hisses out the bleed screws (on rad and hose going into dash) then stops, but no water comes out afterwards. No signs of dripping anywhere, apart from minor leak where the filler neck joins the reservoir. Very confussed!
Any help is much appreciated.
Am selling it because i'm going to Australia in 11 days!!! Gunna miss the Punto
Thanks James