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Air Con Electrical Fault

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looking for some advice please on an air con fault on my 2003 Focus. I don't believe it's a problem of low gas as it appeared immediately. The system was working well previously and is regularly used.

The compressor clutch doesn't engage either when the a/c button is pressed (though the light on the button comes on) or when the air is set to screen demist.

The a/c button does light up when on the demist position, which it didn't do before.

I have checked all fuses and they are ok, and I have swapped the a/c relay with another to test the relay.

There is 12V at pin 1 on the relay and if I link pins 3 & 5 in the relay socket the compressor runs so the compressor, clutch and wiring to it seem ok.

Any suggestions very welcome as I've reached the limit of my expertise !


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