I need help with a problem with the heating in my 2003 52 plate 1.8 LS.
Once the car is warm (between 75 -90 ) if I turn on the heating I get hot air for about a minute then it cools down to luke warm.

The car has a brand new thermostat and has been bleed correctly ( even tried removing the lower pipe when hot and the engine running)
Both pipes leading to and coming away from the matrix are too hot to touch by hand.
There is a new control panel been fitted for the heating controls
I've taken the side panels off inside the car and checked the operating arms for movement when turning the dials and they move OK, not sticking.
There is no water in the passengers foot well.

Any ideas ???????????