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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

Hi Jock. Is the car 4 wheel drive? 4x4 centre bearing? that would be my first guess. does it make the noise when stationary?

Hi Dave Thank you. I will give the guy who looks after my car and get it booked in for a diagnosis. No warning lights and to be honest I haven't noticed an increase in fuel usage either. My daughter has a 2025 BMW and the grill on that certainly opens and closes. I will post the outcome for my car once it's been looked at. Thanks again for your help

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

Hi Paul Just contact https://www.ecutesting.com they are in Derbyshire they offer and excellent service and I have used them several times they also Warranty all their work Worth contacting them and talking through what you need Dave