Car: BMW 2007 530i (N52 Engine) 210,000KM
Details:
- Single accessory belt for AC, Power Steering, Alternator
- AC is clutchless variable displacement
- Tensioner and idler pulley's replaced
Problem:
- There is a groan in the cabin when the AC is turned on
- The groan is exacerbated when there is load on the steering wheel while turning
- The groan disappears when the AC is turned off
- The groan is there when engine is cold, regardless if AC is on or off
What I've checked:
- No play in the pulleys for any accessory
- No groaning noise in the engine bay
- AC performance is good
- Power Steering performance is good
- Power Steering fluid has been flushed
The groan sounds like a power steering groan (especially when low on fluid) from my previous experiences. However, what's throwing me off is the noise is only there when the AC is running. Can the load of an AC cause another accessory to show symptoms?