Hi Dave,
I will give it a go tomorrow. If anything I suspect the alternator pulley or water pump if it is one of the auxiliary pulleys as there is no difference with the ac on or off.
Going to be investigating for a possible boost leak, as the car is quite airy under boost, may just be normal for these engines though 😅.And also a few over things to go over aswell will let you know how it goes!
James
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jvmes ·