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Whining noise from A/C Compressor

2958 Views 5 Replies 4 Participants Last post by  nuwaus
Hi everyone!

I have a 320d pre-facelift with M47 engine and my A/C Compressor making a strange whining noise when the clutch is engaged.

This whining noise changes its pitch with the engine RPM and when it happens I get poor cooling too.

I have changed everything except for the A/C compressor including evaporator, condenser, expansion valve, filter and cleaned all the hoses.

I read some says it happens when lack of oil/lubrication in the compressor or when low on freon, but I have topped them up too (not sure if it leaks)

Can anybody help me to troubleshoot this issue as it's a real headache now for almost a month?
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yeah...that's about right my wife's wined and it too changed pitch, soon there after no cold air...I changed the compressor took it to the shop.. .charged with freon (1.6 lbs) and haven't heard a complaint or wine since...about the car that is,,,

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