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Old 23-01-2014, 02:24 PM   #1
james22
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Default A/C Relay.. Purpose?

Hi All

Recently the compressor on my A/C started clicking on and off every few seconds. I pulled the A/C relay out from fuse box near battery and noticed that now the compressor works fine? I replaced the relay with a new one and have the same problem?

What's the point of that relay if A/C works fine without it?

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Old 23-01-2014, 04:00 PM   #2
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Default Re: A/C Relay.. Purpose?

I would guess the fail safe mode is ON for safety so you can demist your window.

The relay I would guess is being used by the climate control or something to turn it off at a certain temp hence a I would say a faulty sensor is to blame.
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Old 23-01-2014, 04:10 PM   #3
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Default Re: A/C Relay.. Purpose?

compressor cutting in and out quickly usually means low gas

sorry can't answer the other part of your question but post #2 makes sense
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Old 23-01-2014, 06:21 PM   #4
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Default Re: A/C Relay.. Purpose?

the compressor relay is to operate the clutch.

the A/C relay is to operate the fan-climate control systems.

I only had this occure with climate control and faulty fanspeed controller.
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Old 23-01-2014, 10:54 PM   #5
james22
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Default Re: A/C Relay.. Purpose?

Thanks for the replies.

The gas has been replaced so I can rule that out. Its a AU3 XR8, so no climate control.
So what does the A/C relay underbonnet actually do? Does it tell thermofans to run at high speed and the cut A/C compressor out at WOT?
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Old 25-01-2014, 04:18 AM   #6
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Default Re: A/C Relay.. Purpose?

Nevermind.... Just destroyed another gearbox.. Too much ******* torque... Thanks for the replies
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