AC Pulley metallic noise

[SupraLEDrears]

So I'm just sorting out things one at a time. I've noticed that my AC pulley makes a grinding noise like metal on metal. It does it whether the AC is on or off. If I spray som WD40 into the centre it stops for a few hours. How do I get rid of this? Thanks(AC is working fine)

 

93 NA manual

[Fitz]

Knackered Aux Bearing?

[Chris Wilson]

Hi, thanks for that ECU

 

As the pulley is locked to the compressor waddle plate when the A/C is on (assuming it has enough gas in it to operate the low gas pressure switch), the big bearing inside the pulley will not then be turning.

With the A/C off, or not enough gas charge for the safety switch to allow the A/C electromagnetic clutch to engage, the pulley spins supposedly freely on the bearing within it. Therefore if the A/C pump is

actually being engaged, and the the noiuse is still there, it can't be the bearing making it. If the noise is there with the A/c off and the clutch disengaged, it can't be the compressor itself. Belt noise? Some

brands can make a lot of odd noises, spray the *belt* with water or WD40, does the noise stop? It may be you are getting WD40 on the *belt* when you spray the pulley.

Is it there if you run the engine for less than a couple of minutes with the belt off altogether? Listen *CAREFULLY,

so you don't entangle it in anything moving, and poke it through your head....), with a screwdriver against your ear, touching things, you should be able to find the source like that. It is NOT a

health and safety approved method though!!