noticed today when I set the heater after 5 to 10 minuits it cools down any help please

Hi Brian, can you give any more information to work with. Not having the full information its difficult to make an accurate diagnosis it could be a number of things. On an older car I would have suggested the thermostat was stuck open therefore, not allowing the engine to heat the water fully

Thanks Kenny for your replay

Got a 04 x type diesel 2.0 green cream leather upholstery yes i know thats real no help but i just like saying it.

Ok last 2 or 3 days setting heater at about 22 it has worked ok nice and worm and then it starts blowing cool, i dont have the A/C on as it needs charging so its not on auto as recomended. If i do alter the temp it will warm up again and then cool again 

hope you can help thanks Brian