Technical Metal-on-metal rubbing noise on the aircon pump area

[frankal]

Hello,

Spring is warm here in Toulouse, and I've started using the air conditioning on my 2005 Doblo 1.9 JTD.

The air conditioning works quite well, but a metal-on-metal rubbing noise can be heard when the following conditions are met:

1. The air conditioning is on
2. The car is moving
3. I turn left OR I start moving

No noise if the car is stationary, if I turn right, if I'm driving straight, or if the air conditioning is off.

I looked for signs of rubbing around the air conditioning pump, but found nothing.

The accessory belt and tensioner pulley are new.

Does anyone have any idea what's causing this strange noise?

 

[bugsymike]

Hello,

Spring is warm here in Toulouse, and I've started using the air conditioning on my 2005 Doblo 1.9 JTD.

The air conditioning works quite well, but a metal-on-metal rubbing noise can be heard when the following conditions are met:

1. The air conditioning is on
2. The car is moving
3. I turn left OR I start moving

No noise if the car is stationary, if I turn right, if I'm driving straight, or if the air conditioning is off.

I looked for signs of rubbing around the air conditioning pump, but found nothing.

The accessory belt and tensioner pulley are new.

Does anyone have any idea what's causing this strange noise?

Belt slipping?
As a quick test when it is making the noise, just before pulling away spray belt only, with WD40 and see if it affect the sound.
Spray is only thin and will soon rub away, it is only to test.

 

[ZaphodB]

I turn left OR I start moving, but not when I turn right

Engine mount maybe ?

 

[frankal]

If it's the engine mount, the noise would be present even if the air conditioning is off, I suppose.

 

[frankal]

Belt slipping?
As a quick test when it is making the noise, just before pulling away spray belt only, with WD40 and see if it affect the sound.
Spray is only thin and will soon rub away, it is only to test.

I'll give it try, even though I'm not comfortable with putting lube on a belt

 

[bugsymike]

I'll give it try, even though I'm not comfortable with putting lube on a belt

I know what you mean , but it is very thin and rubs off quickly, just one quick burst on the belt area only as it is making the noise ideally, just to prove or not that it is the belt. I am not saying drown it.
Farm shops sell aerosol sprays for belt dressing which is sticky for hard old fan belts.
In the old days dodgy car dealers used to run a child's wax crayon on the inside of fan belts to stop them squeaking.