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[Stallion]

pretty much the title says it, previous ac post pointed towards faulty compressor. but now wanted to know if anybody knows any signs of a fully/half faulty ac compressor. 

[Andy B]

pretty much the title says it, previous ac post pointed towards faulty compressor. but now wanted to know if anybody knows any signs of a fully/half faulty ac compressor. 

Seeing someone like MarksDTM who has a set of hoses & gauges & can see what pressure etc is where.

[albitz]

would it be too simple to put a live straight to the live terminal and see if the clutch kicks in and the compressor spins ?
Ive done it before, but Im not going to advise someone else to do it to their car without knowing the possible consequences.

[Stallion]

Had a pop round the local garage, vacumed the ac gas out, and only 15gm came out of it, which means there wasnt enough pressure, Although compressor was running, nothing was coming out. So now need to still find that blaady LEAK!! 

[sassanach]

faulty? in what way.

[Andy B]

Had a pop round the local garage, vacumed the ac gas out, and only 15gm came out of it, which means there wasnt enough pressure, Although compressor was running, nothing was coming out. So now need to still find that blaady LEAK!! 

if the system had that little gas in, the low pressure switch won'y have made which means the compressor was probably not engaging.

[Stallion]

faulty? in what way.

as in the way of becoming completely buggered..

[Lazydocker]

Had a pop round the local garage, vacumed the ac gas out, and only 15gm came out of it, which means there wasnt enough pressure, Although compressor was running, nothing was coming out. So now need to still find that blaady LEAK!! 

if the system had that little gas in, the low pressure switch won'y have made which means the compressor was probably not engaging.

But after that 15g came out, did they carry on the Vac test to see if it held a vacuum?

Mind you... Mine did when they checked it today, until they took the pipes off and found a leaky valve Mind you, they replaced it FOC

[Stallion]

Had a pop round the local garage, vacumed the ac gas out, and only 15gm came out of it, which means there wasnt enough pressure, Although compressor was running, nothing was coming out. So now need to still find that blaady LEAK!! 

if the system had that little gas in, the low pressure switch won'y have made which means the compressor was probably not engaging.

Thats the thing andy, previous post (Ac now where) fingers were pointed at the compressor but i did tell you guys i saw the compressor running for sure? And your not the 1st to say low pressure will stop the compressor from engaging, but mine did??  :-? :-? :-?

[Stallion]

Had a pop round the local garage, vacumed the ac gas out, and only 15gm came out of it, which means there wasnt enough pressure, Although compressor was running, nothing was coming out. So now need to still find that blaady LEAK!! 

if the system had that little gas in, the low pressure switch won'y have made which means the compressor was probably not engaging.

But after that 15g came out, did they carry on the Vac test to see if it held a vacuum?

Mind you... Mine did when they checked it today, until they took the pipes off and found a leaky valve Mind you, they replaced it FOC

[/highlight]

I was in the same boat, topped up then see got a leaky valve, then replaced the valve topped up again and had this issue (no cold air) . Lucky you got it for FOC, and sorted. 

[sassanach]

a faulty  compressor only means two things to me a,it leaks or b, it dose not compress ie 150 psi + on the high side

[Stallion]

a faulty  compressor only means two things to me a,it leaks or b, it dose not compress ie 150 psi + on the high side

didnt understand that sorry 

[Aeroman]

I think he means that there are only two real faults that you can blame on the compressor (as listed).

There are many other reasons why a compressor may not run. The relay which controls the compressor is fed from the ECU.

At present I'm trouble shooting mine as there is no power to the compressor. Removing relay 5 in the under-bonnet box and jumping power directly to the relay socket pin 8 brings on the clutch and the auxiliary fan - that has allowed me to check the low pressure side of the system is OK. So now it is just a matter of finding what switch is inhibiting relay 6.

[Aeroman]

Re my post above - the car is a 99 2.5 V6.

Earlier models seem to have a  slightly different wiring to the relay box, so check a wiring diagram before trying the jumper check.

BTW a slight top-up and a clean of the low pressure switch contacts has restored normal clutch and refrigerant operation but still no cold air I have no idea where the high pressure switch is (my Omega doesn't seem to have a triple switch but two separate ones). Will post a new Thread about that.

[cem_devecioglu]

Had a pop round the local garage, vacumed the ac gas out, and only 15gm came out of it, which means there wasnt enough pressure, Although compressor was running, nothing was coming out. So now need to still find that blaady LEAK!! 

solution : colored a/c gas (no need to fill completely),  darkness and a special glass to see the dye shining..