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Discussion Starter · #1 ·
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Hi I am desperate for some help. When air con switched off
knocking noise from lower below alternator, when switch on air con switch no noise. Just
had alternator replaced 400 quid noise persists as above please desperate for
some help it is a cmax 2006 many thanks local ford sealer draining wallet fixed a problem not taken in for but now has to go back any help appreciated
 

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Sounds like a problem with the Aircon Pump clutch. My advice would be to take the car to an aircon specialist if such a thing exists in your area.
 

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Discussion Starter · #3 ·
thanks for prompt reply, you would think a main dealer could sort? so why is it that when working clutch is quiet but not quiet when not on?
 

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When it's working, the clutch is engaged and it's all going round together, as one piece so no noise. When it's disengaged something may be loose and able to catch and make a noise. This is only a guess, from a long way off at that, it's just that I can't think of anything else it can be given what you've said.
 

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Just had another thought. You don't say what engine it is, but if it's one of the Citroen derived diesels (1.6 and 2.0) it may be a problem with the crank pulley. I recall people having problems with that when I had Citroens. (3 Xantias, 1 Xsara Picasso 2.0 HDi. Son 1 ZX 1.4i and a Xsara 2.0 HDi ). The pulley is apparently bonded together with rubber to smooth out the drive or something. They become noisy when the rubber is starting to fail.
 
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