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[Matchless]

Chris, we dont have any evidence to say the compressor is faulty.

The a/c guy should have had a gauge set connected when they started to re-fill, as the low side pressure rises to 30 psi then you would hear the low pressure cut-out switch click. After that the compressor clutch should pull-in and the drive plate start to rotate.
You then add more gas, checking that the low side regulates correctly at 30 psi and that the high-side rises normally. Full fill is 960 grammes.

Static pressure (compressor not running and system cool) is around 75 psi. The gas cylinder pressure is much higher than this so the compressor does not 'suck' in the refrigerant.

[MutantCav]

True matchless we dont yet...but always nice to know the option is there if we find out the guy needs it?

[Richard A]

Thanks "Matchless", they did use a gauge set but did not hear the low pressure cut-out switch click, drive plate not rotating (can be turned freely by hand).
Just going to check connector as suggested by Mark.
regards
richard a

[Matchless]

But did they see 30+ psi on the low side before condemning it??

[Kevin Wood]

But did they see 30+ psi on the low side before condemning it??

This is the key. They seem to have assumed 150g of refrigerant will be enough without checking pressures.

Kevin

[Richard A]

Matchless and Kevin, this is real service, thanks. Sorry don't know if they checked for 30psi, can I get the clutch to engage ie can I press any combo of switchs, all fuses and relays are fine but will look at connectors in the next hour, any other things to check ? Problem is I can't remember the last time I saw the plate rotating.
regards
richard a

[dbug]

Matchless and Kevin, this is real service, thanks. Sorry don't know if they checked for 30psi, can I get the clutch to engage ie can I press any combo of switchs, all fuses and relays are fine but will look at connectors in the next hour, any other things to check ? Problem is I can't remember the last time I saw the plate rotating.
regards
richard a

As i've said previous replies this post - check compressor clutch operation b4 spending money!!
Check as follows -

If a/c compressor breaked - normally a stuck clutch.  You can check this by pulling elec connector plug off compressor & putting 12v directly across the 2 pins on the comp - ensuring correct polarity!  If clutch ok you will hear it pull in with a loud click - if breaked silence!

Free & takes 10 mins

[Richard A]

Thanks "dbug", the car is on the drive of my house not on a ram, to access the pump from the top of the engine is err "tight", will give it a go.
regards
richard a