Thanks gents for the detailed replies.
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Thanks gents for the detailed replies.
Yes that's what mine was doing on and off, got worse (over about 3 years) and now happens all the time when you press the recirc button and has led to actuator failure (buzzing). The root cause is lack of lubrication on one of the mixer flap plastic rod parts - you can fix it if you have small hands and want to take the stereo head unit out and some other things (look up burping / farthing on disco3.co.uk as there is a detailed guide there). My hands are too big to get in to fix it and I was too lazy ... Renovating house at the moment so off to the dealer to fix as I'd rather spend my time working in the house instead of the car !
Thanks everyone for the great information! this has become a really detailed and helpful thread for people like me starting out with land rovers.
I am inspecting a couple this week, fingers crossed.