The 2 different volume requirements are on a sticker under the bonnet, so garages shouldn’t really be putting the wrong amount of gas in, unless they don’t understand the 2 and 4 zone differences. The garage asked me when I had mine done.

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

4434Morrison wrote:

When I first had my aircon recharged in my current 2012 4.4 TDV8 a couple of years ago they recharged it as a 4 zone system with 880g of refrigerant and the aircon would not blow cold. The problem it was a two zone system and only required 700g.

Once the refrigerant volume was reduced to 700g the aircon blew ice cold and still does.

I do a complete aircon recharge every spring as a matter of course and it's always ice cold during the hot summer months...

I mention this as the technician recharging the aircon at the time to 880g refrigerant, was unaware of the difference in the aircon refrigerant volumes depending on the two or four zone systems in the L322 and started traying to sell a new compressor and all sorts of additional and clearly unnecessary part replacements.

I mention this as a cautionary tale to evidence that refrigerant volume is critical on the L322.

I'm not saying it's not possible because mistakes do happen but I'd be surprised it's not just mis-print. As the dual zone system also has a greater capacity, to attain the same pressure, it requires more refrigerant and when they're filling a vehicle, they have the pressure gauges on the machine.

Worth asking but the technician who originally filled it would have been able to see if the pressure was too high from filling with 880g instead of 700g. 2015 Range Rover Autobiography 4.4 SDV8

The machine will fill to whatever weight of refrigerant is input into it, the pressure values are immaterial during filling - and are temperature dependent anyway. At best, assuming they did a function check (unlikely) then as long as they see the high side go up and the low side go down once the engine is started and compressor engaged, for the majority of fast-fit's, that's 'good enough' - the same probably goes for most dealer filterspinners, across all brands.

ETA - make sure they do a proper 'degas/regas', not just recover the excess.