AC squeal only on right turn, with a warm engine


I have a weird problem with my Volvo v70 2001, 230000 miles.

There is a passenger side squeal, but only when I turn right and the AC is on. Obviously my first thought is that it is some sort of belt or pulley squeal. But, if I turn off the AC, centre the wheel or turn left it stops, which seems illogical.

It starts about twenty minutes into each journey and gets progressively worse, then vanishes the next day when the engine is cold.

I have a small power steering fluid leak and the fluid is a bit before the 'cold' line in the reservoir. I haven't checked the level when warm. It's it possible that an insufficient amount of fluid when warm is causing this somehow?

Any thoughts appreciated.

Doug Happy

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could be a lot of things

Since it involves turning, it might be a "squealer" on the disc pad, to warn you when it's getting worn too much. Also could be the tire itself squealing since one side has more pressure on road in a turn than the other side of the tire. Could be bearings in the hub. Just too many things without being able to hear it.

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Thanks - some clarifications

Thanks for the reply.

It isn't the brakes /discs as I changed those all round a few weeks ago in preparation for Swedish winter Happy

I changed to winter tires at the same, and the sound happened before and after these changes.

The sound happens when the car is at a standstill with the wheel turned to the right, but only when the AC is on.

It also continued when the engine was off and ignition was at position ii

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when engine was off the sound continued?

That's maybe something electrical or vacuum, but latter would stop shortly after the engine was off. If you turn ignition off suddenly to full off, does it also stop completely?

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Hi, Doug; I've been scratching my head for a couple of days. Your last post stated that the noise continued after the engine was turned off. Hmmmm. How long did the noise continue once you turned off the engine? This bit of info eliminates the engine and drive train. I'm leaning towards a blower motor bearing. Open the glove compartment and listen. (the blower motor is behind the glove compartment). Unsure of why it would make noise when only turning right, unless there is something in the blower motor encasement? Mouse nest (I see that a lot)? Pencil or pen dropped down through the defroster vent? The A/C compressor engages when the A/C or the DEF is requested.
Good luck.

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Are you sure that the noise continued

when the engine was completely turned off? You originally said it only happened when turning right and the AC was on. Something here isn't consistent. About the only thing I could think of that would continue to run with the engine off is a cooling fan for the radiator. Of course, using the AC, this creates more need for engine cooling. I recall some cars having that fan switch on after the ignition was switched off. That fan is something like an airplane propellor which when turning against it normal axis of rotation puts lateral stress on the bearings. If you've even played with a gyroscope, you'll know what I mean. I could imagine that a bad fan bearing could be a potential culprit as could any sort of spinning object that remains so with the ignition turned off. You might want to revisit that statement that the noise continues with the engine off but the ignition position to apply power to accessories.

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back to basics

No no no to most all of the replies. You discount the belt because it goes away when you center the wheel and turn off the ac? When you do either of those things you just reduced the load on the belt. When you turn sharply the power steering pump is doing more work. Combine that with the drag added but the ac compressor and the belt has trouble turning everything it spins and complains. It's very obviously due to the extra drag of the ac compressor. Make sure the tensioner on the belt is tight. Check the belt for wear. Cracks appear on the inner side and fraying on the edges. If so replace it. It doesn't happen when it's cold because a cold belt is tighter than a hot one.

it is possible for low fluid to make the power steering pump work to hard.

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