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Old 05-07-2019, 14:07   #1
Juttie
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Air con not working

I have noticed air con not working thought it was low on gas so had that done and leak tested all ok looks like the clutch is not being engaged is it just a matter of putting power to clutch to see if it's working.
I read somewhere that the ECU also controls what the clutch does is this correct as I have a aftermarket syvecs ecu and was just wondering if this may not be configured correctly.

Many thanks
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Old 05-07-2019, 20:35   #2
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Does anyone know if you can buy the clutch and pulley separately or if its shared with another model as only need a clutch?.
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Old 05-07-2019, 20:36   #3
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Does anyone know if you can buy the pulley clutch separately as I only need the clutch or if its shared with another model.
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Old 06-07-2019, 08:54   #4
TrickyDick
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I had that problem when my ViPec ECU was fitted and after a lots of head scratching found the ECU output for the AC clutch was wrong.

You can easily test the clutch by disconnecting the cable to it and applying 12V direct.
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Old 06-07-2019, 09:03   #5
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Yep now tried direct feed to pulley and nothing happens so guess it's the clutch itself have even taken the shim out aswell.
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Old 06-07-2019, 09:10   #6
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Sorry to hear that. You can probably pick up a compresser cheaply and swap clutches as many take them out for dry sump etc. Have to say I miss mine this time of year !!

GL
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Old 06-07-2019, 09:28   #7
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Yeah that's what I'm hoping shame I cannot just get a clutch
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Old 09-07-2019, 17:52   #8
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After some help and advice with my evo 8 air con please.
I have had the system checked and regassed all ok I thought the clutch on pulley was at fault so tried another but still the pulley will not engage. I have tried bridging the pressure sender out still nothing I have checked all relays and fuses. I thought it may have something to do with the syvecs ECU but previous owner informed me it worked intermittently so must be configured. Is there anything else I can try?.
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Old 09-07-2019, 21:13   #9
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Which part of the clutch assembly did you replace?
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Old 09-07-2019, 22:15   #10
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All of it
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Old 10-07-2019, 10:04   #11
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All of it
You have a spare clutch assembly now?
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Old 10-07-2019, 05:57   #12
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Casting my memory back to the second time I got a new compressor fitted to my IX - it was a local garage I used to fit the unit, and they called in a mobile air con business to degas and regas the system.
Once compressor was fitted and regassed, apparently the air con didn't kick in properly, so the air con guy went ahead and wired up the compressor power feed direct from the battery with new wiring and fuse assembly. I'm not sure exactly what else was done, but it certainly fixed the air con and got it working again...
The car already had a Link ECU fitted. Weirdly, the Link was able to control the compressor in "programming mode", but in normal operation it just wouldn't kick in until the wiring fix was incorporated.
Sounds like a similar problem that you have?
Maybe an air con business could help?

All the best with it.

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Old 10-07-2019, 07:38   #13
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So you had a permanent live does that mean your ac was engaged all the time or does it switch the negative side?.
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Old 10-07-2019, 08:04   #14
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So you had a permanent live does that mean your ac was engaged all the time or does it switch the negative side?.
I've no idea on the details on what wiring was added, it was more than simply a permanent live, and I no longer have the car.
All I can say is that extra wiring was added and it fixed the problem of air con not engaging when required.

Sorry I can't be if further assistance.
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Old 10-07-2019, 08:20   #15
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The compressor is supplied +12V from a relay which is controlled by ECU. If you disconnect the connector near the compressor it has one pin that should pull in clutch if its connected directly to +12V. If this doesnt work then there is a refrigerant temperature sensor in compressor so it could also be that I guess?

If clutch pulls in OK then next thing is the relay:


ps there is also a 30A fuse to check (it feeds permanent 12V to relay that is switched to compressor)

Last edited by TrickyDick; 10-07-2019 at 08:38.. Reason: add ps
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