Member Since: 17 Apr 2010
Location: croydon
Posts: 246
air con
30 odd years ago, car airconditioning refriigerant was a lot more colder, and in my world
a lot more efficient than today.
The refrigerant is different today, anybody know why they changed it
27th Jan 2014 4:36 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72788
ISTR it was coz it was full of CFCs so destroying the ozone layer.
27th Jan 2014 4:43 pm
colin6307
Member Since: 17 Apr 2010
Location: croydon
Posts: 246
air con
Then what do they use in food freezers
27th Jan 2014 4:45 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72788
Non CFC refrigerant would be my WAG.
27th Jan 2014 4:49 pm
colin6307
Member Since: 17 Apr 2010
Location: croydon
Posts: 246
air con
Then that refrgerant is different that is used in food freezers ,than cars.
Why can't it be used in cars
27th Jan 2014 4:54 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72788
Way beyond my pay grade. My AC is cold enough & my pizzas are nicely frozen down to -17c. Wouldn't like the inside of the car at that temp though
27th Jan 2014 4:57 pm
sasdiscos
Member Since: 22 Feb 2013
Location: Northants
Posts: 886
134a in cars is cabable of -12 easily with the correct application. R12 as used prev is a hydrocloroflorocarbon. Now banned. 134a is a hydro floro carbon. No chlorine in it. The mustard gas element of gas. When burned emits this toxic gas. They are thinking of using butain now.You remind me of a younger me, not much younger mind...perhaps even a little older!
27th Jan 2014 5:48 pm
colin6307
Member Since: 17 Apr 2010
Location: croydon
Posts: 246
air con
Thanks excellent reply, why are they thinking of Butain?
27th Jan 2014 6:57 pm
sasdiscos
Member Since: 22 Feb 2013
Location: Northants
Posts: 886
When I started in ref there was a handfull of gasses. Now there are hundreds. Just another one of there ozone saving ideas. It won't be all butune but a mix. I think they are looking at 417a as well. 404a was supposed to be a long term replacement but now a few years later they are saying they are going to ban this as well. We use ammonia a lot. It's ozone friendly but highly toxic and deadly to all living tissue. This is industrial tho, not car ac.You remind me of a younger me, not much younger mind...perhaps even a little older!
27th Jan 2014 7:28 pm
colin6307
Member Since: 17 Apr 2010
Location: croydon
Posts: 246
air con
Will these new gases make the car colder
27th Jan 2014 8:22 pm
sasdiscos
Member Since: 22 Feb 2013
Location: Northants
Posts: 886
Nope, if your car isn't cold, there is prob something wrong, r 12 and r134a have almost the same correlation to temperature to pressure relationship. Ie, they should be the same at the same engine revs. Cars will run an ac system at no lower than about 3 bar, let's say between 7 and 9'oc. This allows for a superheat of about 7 oc, a car ac system should run no lower than 0oc evaporating temp, this gives an air temp of a minimum of 7oc. Any lower and you start to freeze on the evaporator. This would require a defrost cycle. Not really possible on ac.You remind me of a younger me, not much younger mind...perhaps even a little older!
27th Jan 2014 8:29 pm
colin6307
Member Since: 17 Apr 2010
Location: croydon
Posts: 246
air con
You technical where i am not,
From memory when in Cailifornia around August 1982, and some later years their aircon
was a lot better than our new cars.
I have a friend, had the old gas in his car, then needed regasing, had to have a conversion to his car for new gas, complained to me, never as good as the old stuff
27th Jan 2014 8:40 pm
sasdiscos
Member Since: 22 Feb 2013
Location: Northants
Posts: 886
That would be r49. A drop in replacement for r12. I don't have the conversion chart to hand for that, when I have I will let you know.
Steve.You remind me of a younger me, not much younger mind...perhaps even a little older!
27th Jan 2014 8:45 pm
colin6307
Member Since: 17 Apr 2010
Location: croydon
Posts: 246
air con
Steve many thanks, look forward to your reply.
27th Jan 2014 8:51 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
How much colder do you want it??
The refrigerant in the D3 is not the limitation as the system can produce very chilly temperatures. If you get any colder things tend to freeze.
Having sat in an armoured D3 at temps approaching 50 deg C I can testify that it works just fine when running correctly.Land Rover - Turning Drivers into Mechanics Since 1948
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