thermostats can stick open making it take longer to get to temp, or near to temp. for you to have no hot air in the car it will almost certainly be a locked heater matrix core, or the flaps arent moving to hot when the control is moved to hot.

i seem to remember an issue wth the cables (either the focus, early mondeo or mk4 fiesta, cant remember which im afraid) where the outer cables were slipping and although the controls turned as normal, the outer cable moved, rather than the inner cable being pushed/pulled, leading to controls not working.

 

thermostats can stick open making it take longer to get to temp, or near to temp. for you to have no hot air in the car it will almost certainly be a locked heater matrix core, or the flaps arent moving to hot when the control is moved to hot.

i seem to remember an issue wth the cables (either the focus, early mondeo or mk4 fiesta, cant remember which im afraid) where the outer cables were slipping and although the controls turned as normal, the outer cable moved, rather than the inner cable being pushed/pulled, leading to controls not working.

I open the front plastic mask inside and I check when I move the control to hot i can hear the sound of the flaps I think that they are working fine ...because before there was a very little hot air in the car but now not at all ....

 

Tddi focus has an issue where the blades on the water pump come away, still marginally turns avoiding over heating of the engine but doesn't push the hot coolant into the matrix to hear the air. If you sit at idle for a long time with the heater off then turn it on low do you get a little heat then disappears quickly. Give that a try just to see but I've done a lot of water pumps for the same issue.

 

Tddi focus has an issue where the blades on the water pump come away, still marginally turns avoiding over heating of the engine but doesn't push the hot coolant into the matrix to hear the air. If you sit at idle for a long time with the heater off then turn it on low do you get a little heat then disappears quickly. Give that a try just to see but I've done a lot of water pumps for the same issue.

That's the problem that i have . When the engine is on working temperature then I turn the fan to blow hot for about 2-3 min. I have hot air after that slowly going to cold ....and after that totally cold ...

 

When i changed my cambelt and water pump, my pump had plastic blades and none were intact. Replaced with an alloy pump. Only changed it as i was doing cambelt and not because i had heating problems.

 

as above, sounds a bit like the pump...

the coolant expansion tank isn't always a good place for temperature checking, plus there is a risk of being burnt. The top radiator hose is the exit point of coolant from the engine, just hold that.