Air Con Electrical Fault

[BloodyNiceBloke]

Hello,

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 !

Thanks.

[mick85]

You probably have low gas u would need connect to ac machine an check wat pressures are in the lines an right amount gas in it system then u will have good indication where to go next

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[BloodyNiceBloke]

Thanks but I don't believe the problem is low gas. It will be an electrical fault for the reasons I said in my post.

[mick85]

Well it is protected by high an low pressure switch which will cut compressor out have u got a multimeter an wiring diagram

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[btmaldon]

If the pressure is low the compressor wont activate as it needs the PAG oil which is mixed in with the gas to lubricate it to avoid it seizing up.

[stef123]

Sounds like a low gas problem to me..

[BloodyNiceBloke]

Mick85, thanks for the suggestion about the high/low pressure. I can't find any wiring diags relating to a/c in my Haynes manual. Do you know where the switch is ?

[mick85]

To be honest I would be getting it checked for gas first make sure right amount in the system cause either way u cannot replace a component without removing all the gas so ur snookered

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