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Hi Hamid Welcome to the Forum First check the engine bay side there is a distribution valve and Auxiliary water pump make sure it's working. Then inside the car if all fans and controls are working check the Final Stage Resistor (used to be a common fail on E53 X5's) Have a look at www.realoem.com put the last 7 digits of your Vin into the search box it should bring up your model, then check the Heater section you should find the FSR (Final Stage Resistor) in the blower motor. You will now have all the part numbers you need to find a replacement at a sensible price. The FSR on X5 E53 models was a fiddle to change but not beyond anyone with a bit of sense Dave

Mileage is154k and MoT to Aug 2nd 26. Sorry for earlier mistakes.