A/C whirring sound

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My Name: Bloog

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Posts: 5
Joined: Fri Oct 08, 2021 8:07 am
Model: C3 Picasso
Year: 2012 (62)
Engine Size: 1.6
Fuel Type: Diesel
Mileage: 75000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: Yes
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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Switching on the A/C of my C3 Picasso (1.6 diesel ) produces an annoying whirring sound that changes when revving. It's similar to the sound made by the extractor fan of my gas boiler when a bearing is about to fail.

Searching online suggests it might be the aircon compressor itself, the pulley bearing or the clutch.

Has anyone here come across this problem?
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My Name: Ozvtr

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Model: C3 2002-2005, Original shape model
Year: 2003 (53)
Engine Size: 1.4 (8v)
Fuel Type: Petrol
Mileage: 80000
Trim Level: Other
Gearbox: Automatic PRND
DPF: No
LHD or RHD: RHD
Engine name: TU3 (75 PS)
Location: Brisbane, Australia.
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Have you owned the car from new?

Have you had (or do you know if) the system has ever been re-gassed, at all?

There are 3 possibilities
1. The compressor is mechanically faulty. Typically...just worn out. Internal bushing or pistons.
2. Low system oil. If the system has had a leak at some time and has lost oil but not been topped up.
3.Low refrigerant. The oil AND refrigerant "dampen" the compressor noise. If the performance of the air condition system seems to be below par, it could be low on refrigerant.

Problems with the clutch tend to cause the compressor not to "kick in".
Problems with the clutch bearing cause a squealing or grinding noise.
If its a "clackety" noise, its the compressor (as above). Try a re-gas.
My Name: Bloog

Member
Posts: 5
Joined: Fri Oct 08, 2021 8:07 am
Model: C3 Picasso
Year: 2012 (62)
Engine Size: 1.6
Fuel Type: Diesel
Mileage: 75000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: Yes
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
Has thanked: 2 times

Post

Thanks for your reply.

The car is a recent purchase from a Citroen dealer. No idea if it's ever been re-gassed. The sound is similar to that shown on a C3 here:
Closer to squealing/grinding than clackety.

The dealer has proved unresponsive so I'll just leave A/C off for now and ask my local mechanic to check it out at the next MOT.
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