Re: 5kCSTQ A/C Compressor Noise

[charlie@elektro.cmhnet.org (Charlie Smith)]

Earlier, Chris King wrote:
> 
> Our stories are almost identical...the original compressor in my '88 5kCST
> was leaking badly, so I also replaced it with a good, used compressor.  And
> mine makes the same identical noise as yours, while pressing the "ECON"
> button turns the compressor and the noise off.

    Yup, the noise is definitely from the compressor.

  
> In fact, my car has made this noise since I bought it in April, meaning the
> original compressor made the same identical noise.

    My original compressor was altogether silent.  

> Someone mentioned that it might be the "idler pulley", because, what are 
> the chances of me having two compressors make the same identical noise?  
> Slim to none, I think... 

    All that got changed in my system was the compressor.  Besides,
    there's no "idler pulley" in the belt to the compressor.  The only
    idler pulley is the one that tensions your cam drive belt.  The 
    alternator, hydraulic pump and A/C compressor each have their own belt,
    and each component is separately adjustable to tension it's belt.

    Makes me wonder if your noise is the same as mine?  Mine is a loud
    whirring noise, that gets louder the higher you rev the engine.
    At 3000 it's not too bad, but by 4000 it's real objectionable.
    If you pitch your voice real low, and say whirrrrrrrrrrrrr ...
    it's about like that  :-P


And, Igor Strashny wrote:
> 
> Just add some extra refrigerant oil in the A/C system and noise 
> will gradually stop.   Some roaring is OK for an old York compressor 
> and it does not affect its operation.

    I'll try adding refrigerant oil, I have the manifold guages needed
    for this.  But, this is a Delco swash plate piston pump, not one of
    the York piston pumps.

> Unfortunately when mechanics recharge your system they usually do not add any
> oil since small quantities of it mixed with the freon in the can. So you have
> to drive around to find somebody who has the tool to add some refrigerant oil
> in your system.

    Thanks for the suggestions guys!  I'll keep you posted on what
    happens from here.

    - Charlie



Charlie Smith   charlie@elektro.cmhnet.org  614-471-1418  
Columbus, Ohio USA


 4 wheeled fleet:			 2 wheeled fleet:
_________________________               _________________________
86 5kCSTQ      				92 Ducati 851SP     851cc
69 Porsche 911S   3,200cc		95 BMW R100-RT    1,000cc
81 VW Diesel Pickup  			62 BMW R27          250cc