Air-con noise from pulley

darrenm · Jan 2, 2014

My aircon started making a load whistling noise from aircon pulley

darrenm · Jan 2, 2014

Any anyone just changed the pulley or is it a complete new pump

steventoon · Jan 2, 2014

I would reckon a new pump. I had this recently on my Jag XKR. The pulley on that was on some magnetic clutch and I just purchased a good second hand unit.
Remove the belt and see if there is any play in the pulley.

robhew86 · Jan 2, 2014

Is it permanant noise or only when ac is switched on ?

darrenm · Jan 2, 2014

More perminant and seems to get loader as you go faster/ higher revs

steventoon · Jan 2, 2014

sounds like you need a new pump to me.

robhew86 · Jan 3, 2014

Its deff not just a squeaky belt?

ratty · Jan 3, 2014

The other option if buying a replacement is too costly is to replace the aircon pump with a non aircon idler pulley and belt.

darrenm · Jan 3, 2014

No it's not the belt looking at the aircon pump the clutch isn't working and with belt off the pump is very hard to move and not smooth

ratty · Jan 3, 2014

darrenm said:
No it's not the belt looking at the aircon pump the clutch isn't working and with belt off the pump is very hard to move and not smooth

it should spin freely when disengaged and lock up when engaged. It does sound like it's knackered. If you wait until dark and then start the engine up with the belt on you may even see some sparks from it.

darrenm · Jan 3, 2014

Pump off and checked then put back on and regased and still making noise
My mate who does aircon is saying it's not the pump

ratty · Jan 3, 2014

darrenm said:
Pump off and checked then put back on and regased and still making noise
My mate who does aircon is saying it's not the pump

take the belt back off and feel for roughness in the other pulleys. Pay particular attention to the idler and tensioner pulleys.

darrenm · Jan 3, 2014

The only one that feels tight is alternator

ratty · Jan 3, 2014

darrenm said:
The only one that feels tight is alternator

tight or just heavier turning?

is it still smooth? if you spin it does it keep spinning or stop dead?

darrenm · Jan 3, 2014

As if it had locked up tight

ratty · Jan 3, 2014

darrenm said:
As if it had locked up tight

It's goosed

sierrafery · Jan 3, 2014

the alternator is not alone there the vacuum pump is attached and IMO that's fubar'd...but afaik it will not spin freely due to the pump even if it's good...and if it doesnt spin with the belt you'll get a "no charging" warning on the dash...unfortunately you can't buy just the pump as a spare

...shame

darrenm · Jan 3, 2014

It seems to be charging ok at moment

darrenm · Jan 4, 2014

Seems odd as when aircon starts up there is Deffo a rattle from aircon pump / pulley but there still is a whistle from somewhere

darrenm · Jan 4, 2014

Sorted found a manifold stud that had become wedged against pulley so it's manifold stud replacing time again

Air-con noise from pulley

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