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Discussion Starter #1
Hello, Hoping someone can help on what to try.

When I go to manual climate control and press the A/C button it shows 'A/C on' on the screen but it never starts up. Looking at the A/C clutch in the bonnet it never starts spinning.
The A/C clutch relay in the fuse box in the bonnet is also not clicking at all.

Now the issue is, I took out the clutch relay, and got a 12V supply and attached to the power terminals 3 and 4 . And the clutch is clicking and operating correctly, once this happens pin 1 and 2 are connected.
Does this mean my relay is working ? If it is indeed working why in the car is it not being turned on or off.

Is there anything before the clutch relay that I could check ?

Also if I take out the clutch relay. And measure the voltage in the socket (where the clutch relay is meant to go) between the positive and negative terminals, the top 2 vertical ones. I get a reading of around 8.3 volts. If I press A/C on, it is still 8.3 volts. A/C off and it's 8.3 volts also. Shouldn't this measure 12 volts when it's set to A/C on or the relay will never turn on.

Could this mean a problem somewhere else?

Hope someone can help or offer some suggestions on what to try ?

Also if there is an issue with the aircon gas, and it needs regassed, how far should I get to in the process ? Should the clutch relay still be clicking and the a/c clutch turning on and spinning round.

If I short out the connections without the relay, the a/c clutch turns on and starts spinning.

Thanks
 

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thats a busted relay then, either it works or it doesnt.

Ive got one in my thread which is brand new, but its the old style OMRON ones, instead of the mistuba ones. Free, just pay the postage
 

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Discussion Starter #3
But why when I use a 12v power supply in my house and connect it to the relay it turns on and I hear a click, but in the car I don't hear any click ? Seems strange.

Also I'm concerned with this part
"Also if I take out the clutch relay. And measure the voltage in the socket (where the clutch relay is meant to go) between the positive and negative terminals, the top 2 vertical ones. I get a reading of around 8.3 volts. If I press A/C on, it is still 8.3 volts. A/C off and it's 8.3 volts also. Shouldn't this measure 12 volts when it's set to A/C on or the relay will never turn on."

How much would postage be ? And I take it , it 100% works haha. Then if I plug that in and still doesn't work I know its something else.
 

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Discussion Starter #4
If there was an issue with the clutch relay should the a/c fan still turn on even if the a/c clutch doesn't ?
 

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Have you had the AC pressure tested?

If the system isn't up to/or is over pressure then as I understand it the low/high sensors will disable the compressor.

Or maybe your pressure sensors are defective/contacts need a clean?

Do you have a local AC specialist that can take a look?
 

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Yeah i was thinking ac pressure sensor
Going to take a look thanks.

Cause im thinking the ac fan under bonnet should still come on even if the compressor relay was broken.
 

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Discussion Starter #7
I shorted out the ac pressure sensor connector just for a few seconds to see if the fans and compressor would turn on and it did!

So I either have low/over pressure or the ac pressure sensor is defective. Is there anyway to know if the sensor is fine before I get it regassed ? I guess you don't know if the sensor is working but I have low pressure or the sensor is defective and the pressure is fine ?

Easiest way is probably getting it regassed I guess and then if still doesn't work ac pressure sensor faulty? But then I'd have to remove the gas and get it regassed again when the sensor is fitted.

Side Note: Just realised I seem to have 2 accounts here, how do I delete one ?
 

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Yay, that's progress.

How much are the sensors?

An AC specialist may be able to test your sensor or drop in one to test? You might also come to an arrangement for several regas's ;)

Yeah, you might be wasting a regas but if you regas with dye then you'll also be able to check for leaks with a UV light. Then you'll know if your system is 100%

PM me both of your user IDs and I'll see what I can do for you tomorrow.
 
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