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Discussion Starter · #1 ·
Hi all.

I'm normally fairly good at solving problems like this, but this has got me stumped.

Bought my Focus a few months back and always thought the aircon was weak, but thought I could hear the aircon compressor clutch clicking on and off. I just guessed there wasn't enough refrigerant/gas in the system for decent cooling.

I had the aircon regassed at ATS today and they couldn't get it working. They said it had taken 600g of gas and should be working.

Anyhow, now I'm home I can see the aircon clutch is not engaging and so the compressor is not spinning.

I've checked the aircon relay and fuse and they are both perfect, and the aircon relay clicks so I'm assuming the power to the clutch is there.

Any ideas?

Aircon compressor clutch knackered?

Any help much appreciated!

James
 

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There's an electrical connector at the compressor. Maybe come apart a bit? There's also a pressure switch in the pipe which may have failed. It stops the compressor operating if gas pressure is low.
 

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Discussion Starter · #5 ·
Thanks all. Great ideas.

Yes, Ive been looking at 2nd hand compressors and have seen the electrical connection. Think Ill check that and maybe apply 12v directly to it see if the clutch engages. If not I recon its a failed clutch electromagnet or I need to adjust its spacing as suggested above.

Any other suggestions/experiences welcomed please.

James
 

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Did they take the gas back out? Low pressure will mean the compressor will not kick it to protect itself. Try taking it somewhere else
 

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Did they properly drain the system first and fill it up to level advised by Ford? You can't just continue filling it up in the hope it'll eventually work!! It needs draining completly, pressure testing then refilling to the exact level recommended by Ford. You're better off finding a local aircon specialist rather than relying on tyre fitters. It might be the compressor, it might be a pressure switch, it might be a clutch or might be that it's not been properly drained, all the moisture sucked out and correctly refilled. A specialist will charge you less then ATS and also correctly diagnose it.
 

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Yep, I had mine done recently. I replaced the compressor, condenser and main pipes around the side up to the firewall. The guy sucked it out and let it sit to ensure it held vacuum before injecting oil and gassing it.
 

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Discussion Starter · #11 ·
Thanks gents. Amazing, superb replies as ever.

Ive not cured the problem but Ive noticed the air on does work for the first 5 mins of the car being started. It then stops working for the rest of the journey!

So I suppose the electromagnetic clutch and compressor work.

However Ive found a YouTube vid that says if this happens then it could still be the compressor clutch gap.

Hmmmmmm
 

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Discussion Starter · #12 ·
Heres the video about doing the air gap. Funny, it looks like our engine and the symptoms he describes are mine exactly.

 

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I had similar where it worked then stopped, it was the clutch that needed resetting as detailed above, a tool fron amazon to remove the clutch an afternoon and all sorted (no re-gas needed and that is 10 years old.

Nb the clutch wears worse on cars with dual zone climate
 

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Discussion Starter · #14 ·
Thanks Dennis. This sounds like my problem and mine is dual zone climate. Its also done 145k so its had plenty of chance to wear!

What tool did you use please? Do you have a link?

James
 

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Discussion Starter · #16 ·
Well, measured the air gap on mine this morning and its about 1.1mm, so well in excess of the target 0.4 or 0.5mm.

Ive ordered a puller to get the cover off the clutch too so all being well Ill be able to sort this.

Strange - I wonder why having too big a gap means it only works for the first 2-3 mins. Does something expand with the heat when the pump is having to do some actual work?

Any ideas?

James
 

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Discussion Starter · #18 ·
☝🏻 That video above. Not the best source Im sure though. Ill do some more research.

James
In fact the video says 0.3-0.5mm. My bad.

James
 

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Thanks Dennis. This sounds like my problem and mine is dual zone climate. Its also done 145k so its had plenty of chance to wear!
What tool did you use please? Do you have a link?
James
Sorry for delay, it was this one.

Once I figured out how to use it I just had to take a washer out and put it back together.

One issue I had was the retailing bolt span with the fly released, a impact reach sorted it (lucky I had a battery one available at the garage I was working in :) )
 
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