Noddy1875 - you are being perverse in your interpretations. I said "external clean" specifically - and obviously - in respect of the "sealed system" - i.e. the refrigerant circuit itself.

What on earth would you want to do that for? To save a few pennies when it needs a top-up?

Lots of articles on the internet - e.g.:

https://www.carsdirect.com/car-maintena ... -to-fix-it

http://atseuromaster.co.uk/motoring-inf ... 801816857/

https://www.charleshurstgroup.co.uk/nissan/servicing-parts-offers/air-conditioning-service/ Air Con Cleanse: £19.99 Air Con Service: Combination or Air Con Cleanse and Air Con Re-Gas A recharge of the air conditioning gas Replacement of compressor oil Antibacterial disinfectant Replacement of the po...

Noddy1875 wrote: ↑

Mon Mar 25, 2019 6:25 pm

I don't live in a heavy pollen area, so won't bother with this

My dealer refused to drop the pollen filter from the service despite the fact I'd only done 5,000 miles since the last one.

https://www.marshall.co.uk/nissan/service/air-conditioning-service/ There are two options for your Air Conditioning: Air Conditioning Refresh An air conditioning refresh is an anti-bacterial treatment which will completely cleanse the system, ensuring that you’re breathing fresh air in your vehicle ...

Noddy1875 wrote: ↑

Mon Mar 25, 2019 6:15 pm

The Air Conditioning Service includes:

A recharge of the air conditioning gas
Replacement of compressor oil
Antibacterial disinfectant
Replacement of the pollen filter

That's replaced at every annual service so why replace it twice? Costs £40 as part of the service...

From Lookers Nissan.... If your vehicle's air conditioning isn't maintained properly, it can cause more harm than good. Our full Air Conditioning Service can improve the efficiency of your air con system, ensuring you stay cool even in the warmest of summers. When you bring your Nissan to us, our t...

Noddy1875 wrote: ↑

Mon Mar 25, 2019 6:18 pm

What would an "external clean" have to do with a sealed system ???

It's cleaning the bits the air passes through not the fluid...

An air con "service" basically amounts to connecting the car up to a machine which vacuums out your refrigerant, then pumps it back in again topping up to the max level, and then running it with the aforementioned £10 bombs you can get at Halfords. It would be interesting to see that described some...