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Have you checked the alternator clutch pulley,that can give strange effects when it seizes up. Had a listen to all the pulleys through my homemade stethoscope - copper pipe and hose pipe - and apart from the air con pump everything was nice and quiet. Amazing what you can listen to with such a simp...

jonsowman wrote:Could be the air con clutch? Mine rattles sometimes when off but shuts up when the air con is engaged.

It certainly quietens down when the air con is on.

There's a few things to check here, firstly if the a/c pump is noisy (sort of grumbly) then the system is low on gas - the compressor is 'scavenging' and it won't be long before it's shut off by the ECU to save wear. You will hear a noise which will rise and fall in line with engine revs, and stop ...

Fixed
Checked electrical connectors and found one was not pushed in all the way
So old comm2000 unit was the problem.

The air con pump is noisy on my ’02 110hdi 406 and the car ‘shudders’ to a halt when the engine is switched off. The noise disappears above tickover and when the engine is warmed up and strangely seems to be less when the air-con is switched on. Am I looking at getting the pump replaced or is there ...

This forum has been invaluable to me in keeping my ’02 110hdi 406 on the road but now I’ve hit a brick wall and hope someone can throw some light on my problem before I have to resort to booking it into a workshop. As the title alludes to I have the air bag light showing, it’s been like this for the...