Your assistance to the below would be more than helpful.
When i switch on the heating it starts to normally blow warm/hot air, but after a period of time it starts to blow cold air????????
If i switch off heating and switch it on after let's say 30min once again the same story warm air in the begining and then cold.(During summer time a/c properly works without any proble at all)
I visited RR workshop but they told me that they can found nothing as diagnosis shows not any error/problem.
Any idea please of how i can solve such a problem ?

Many thanks

hmmm it could be the internal cabin temp sensor playing up if it thinks its hot in there then the climate could adjust to go cold just a thaught really and not really got a clue  onto no6 Range Rover

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Thanks for your reply.Had a look in manual and i noticed that car has air ram flaps which the more you increase the speed the more close.I am with the impression that hot air stops and cold one starts to blow when i am increasing the speed.I have to recheck if the ram air flaps motor is working or not.
But wonder if motor not working this shldnot be shown in the diagnosis test?