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Discussion Starter #1
So my first real fault on my trusty 4007 that needed Diagbox to tell me what is up.

About 3 months ago the A/C was pretty poor so I bought a recharge kit off eBay and followed the instructions and the A/C was perfect again.

Only 2 months later a proper fault developed and now when the A/C is enabled the light comes on for a few minutes and then starts flashing. The A/C doesn't work at all (blower is working but is not cold).

Diagbox reports a Refrigerant sensor fault - B1079 (temporary) which I cleared but comes back shortly after. I've noticed that the compressor doesn't kick in when the A/C is turned on and when the temp is set to it's lowest settings the radiator fans normally kick in full speed but this isn't happen either.

I have put the gauge that came with the refill kit on the low pressure side and it's still showing a good pressure (30 I think, it was 5 before I refilled it) so I know there isn't a leak.

Anyone have any idea? I don't know how to test the high pressure side, I'm pretty sure it's not possible for a home diy'er.
 

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If your recharge kit has a pressure gauge check you have not put too much gas in system.

I had one that had been overfilled air con worked in cold weather and stopped when hot as it pushed pressure over max and tripped out compressor etc.

I vented a small amount of gas and system worked great
 

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Discussion Starter #3
Almost certain I haven't put too much in as the gauge is at the lower end of the recommended level but nowhere near as low as it was before.

This is the first time I have seen the A/C light flash, it didn't do it before when the refrigerant was low.
 

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Discussion Starter #4
Just went out and put Diagbox on it again and while watching the parameters it shows the Low Pressure Refrigerant value as correct but when I turn the A/C on it change to "Being Checked" then after a few minutes it says "Faulty".

As the low pressure side is correct I'm wondering if the sensor is at fault? Not even sure where it is.
 

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Discussion Starter #5
I have solved the problem. The problem with not enough gas in the system. I bought another can and repeated the same procedure as before and the compressor kicked in and now the A/C is working again.

Oddly it only used half the can and the rest was wasted. I'm wondering now if these cans are any good and can't really put the pressure into the system like a commercial system would.

We'll see how long it lasts this time.
 
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