Hi guys had my air con re-gassed on Friday as it was not working turned out to have to much in so took it out done a vacuum test and a leak test all ok injected gas and hey presto the air con got cold but only lasted a day and no more cold air the iid tool tells me there is pressure but i don't know now why it will not work any ideas where i go next

I've just had mine re gassed yesterday after the recent spell of good weather. Mine was totally empty, had it re gassed, fully pressure tested and now its ice cold - yay,

I can only assume in my case that the seals had dried up and let the refridgent leak out - saying that i'll be monitoring it to see how it performs.

did they put the UV dye in when you had it topped up?

dye put in but i know its not leaking as it had wey to much gas in it when we put it on the machine so no leaks i assume its either a switch or a relay

Difficult to diagnose your problem online but it is the case that an overcharged system will eventually kill the compressor.
Too much refrigerant in a system causes liquid refrigerant in the low side return to the compressor to wash out the lubricating oil and cause the compressor to seize. Heavily overcharged systems will flood the compressor with liquid, which as we all know, doesn't compress too well.
So, overcharging will either cause a compressor to seize, or it'll smash up the internals.

Firstly, you will need to scan for fault codes and then clear them. Next check the compressor is working efficiently but to do that you will need a manifold gauge. It is impossible to test an ac compressor without this tool.

Don't assume it's a switch or relay at fault, in truth it could be one of a multitude of other things resulting in failure.

Thanks for that but for 1 day after the recharge it worked absolutely fine and got really cold then stopped again

Have you scanned for faults?

Can't see any in there I can see gas is in there as I think it was showing that there was pressure but not sure what it was is there anything in particular I should maybe look for

Sometimes after regassing the schrader valves in the high and low ports can stick very slightly open much like on a car tyre valve which will then let the gas slowly come out even with the caps on, also there is a pressure sensor on the o/s on the pipework this shuts the system down if the pressure drops below 2bar or goes over (28bar I think it is), over gassing can be a misdiagnosis of a blockage in the system or more commonly a faulty expansion valve. It would depend on how the conclusion that it was over filled was made I.e from weighing the gas that was removed or from the readings on the manifold gauges?
You could make a visual inspection of the wiring to the pressure switch and maybe then check the iid to see what the pressure reading is  Clickadeeclick

Hi the aircon machine in my friends garage told us that there was over 750 grams in there we took it out then put 600 back in when I looked with the idd tool I am sure the pressure was around the 500 mark but I would need to check again and confirm

Ok must have a leak just used idd tool to check and it came up with low pressure or do i take to garage and see if there is gas in it as suggested to see if there is something else wrong as i said before it was gassed id did not work but then worked for a day after so i assume the compressor is working

You either have a leak and thus low refrigerant, or you have a blocked expansion valve due to insufficient vacuum prior to recharging.
The existing remaining refrigerant will need to be reclaimed and weighed, to see how much has been lost. Pressure test to 250psi using dry nitrogen and leak check followed by a vacuum (not just a quick suck out, on vacuum for at least 30 mins to ensure all possible moisture is removed) and then another recharge to the correct weight. Finally, a full leak test using an electronic leak detector and soapy water around all joints, seals and valves.

You compressor is likely to be ok, but the above needs to be carried out PROPERLY... or you'll be paying your mate another visit at some point again, in the very near future

Thanks will go back to the garage and extract the gas and see how much if any comes out

Yes, but the above needs to be carried out as described, just bunging gas back in without first correctly preparing the system is not only the 'cowboy' charge and hope method, but will more than likely not fix the problem. Insist your mate follows correct procedure.

I checked my rrs with the iid today and mine shows the pressure as 7.2 bar with the a/c running, you need to check what measurement your iid is set to as it can be changed I.e bar ,psi or mpa I think. If it was over charged before then it is likely that it wasn't working previously so someone may have tried to add gas from one of those diy cans from Halfords etc.
Imo there are a lot of fast fit chains and smaller garages that own A/C machines and are quite capable of draining and refilling the system but have no idea of how the system works so when there is a fault other than gas they are unable to fix it (I mean no offence to your friend or anybody else with a machine) but it maybe worth finding someone who specialises in Air conditioning as these people just by looking at the gauges can quite often be able to diagnose the fault or at least rule out most of the possibilities which will probably end up costing a lot less to fix  Clickadeeclick

Thanks for the info and i get where you are coming from so my first port of call is in fact see if there is any gas left in it and if there is then i have another issue so that is where i will start and if no gas it has dye in there so hopefully i will see where its got out