Update on my overheating problem.

Hi I thought I would give you an update on my overheating problem. After much research and advise that just didn't ad up to me I pulled the water pump off and inspected it - it was very much the problem. I found it strange that no one suggested this as the potential problem given the details I gave them - everyone seemed to point in the cylinderhead/gasket direction! Just thought I would share that info. Thanks for the great site. Dean (PS original question below - perhaps I wasn't giving the right info?.

((((((((Hi, I have a 1997 Ford Econovan 2 Litre. Yesterday it overheated and my radiator sprung a leak.
I topped it up with 2 litres of water and after 2 minutes the car overheated and needed another 2 litres.
I removed the cap to stop it pressurising so I could get home but it still overheated and needed 2 litres every few minutes.
Today I started the cooled engine and ran it without the cap and it overheated in a few minutes.
Today I replaced the radiator and again it overheated in a few minutes but with no loss of coolant.
I removed the thermostat but it made no difference - it still overheated in a few minutes.
The heater blows cold air. The heater hose is cold to touch and doesn't feel presurised - I can squeeze it easily.
When I remove the radiator cap and rev the engine the coolant overflows but does not seem to travel in any direction.
This model does not come with electric cooling fans.
I was wondering if you could tell me the likely cause? Thanks.))))))))