airconditioning refrigerant upgrade. - Rolls-Royce and Bentley Forums
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post #1 of 33 (permalink) Old 07-27-2015, 12:21 PM Thread Starter
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airconditioning refrigerant upgrade.

As R12 refrigerant is not available or indeed approved for use any more, and
neither is a later substitute approved, I am looking at changing my Spirit aircon
system to using R134a refrigerant which is the only one in use now in France.
Has anyone on the Forum used the conversion kit from FlyingSpares ?
If so, what problems or pitfalls were encountered ? and were rechargers of the complete system easily found ?

81 silver spirit
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post #2 of 33 (permalink) Old 07-27-2015, 05:02 PM
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There is nothing at all special about the "working guts" of the air conditioning system that get replaced for a R-12 to R-134a conversion.

If you take the car to an air-conditioning specialist you trust they will replace the flex hoses, completely evacuate the compressor and pipes, replace the receiver-dryer, and then charge the system with the new refrigerant and compatible oil.

Brian

The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.
~ Niels Bohr


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post #3 of 33 (permalink) Old 07-28-2015, 09:38 AM
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The hose materials used for R12 and R134a as well as the seal materials are different. R134a can and will slowly permeate hoses that were originally for R12. Original seals may also be made of material that is not compatible.

Doing a proper conversion is not a simple "vacuum out the R12 and oil then refill with R134a and new oil" affair and no one wants to be frequently having to have repairs/refills done on their air conditioning system.

I'm all about DIY, but for something like this I'd rather have those who know exactly what's required to do a good conversion do the work.

Brian

The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.
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post #4 of 33 (permalink) Old 07-28-2015, 11:04 AM
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Hi Firefly
How much is this "kit" from flying spares? what does it include ,I can't find it on their web site.
Cheers
Mike
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post #5 of 33 (permalink) Old 07-28-2015, 11:17 AM Thread Starter
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aircon refrigerant upgrade

Hi Mike,
If you look on FlyingSpares website for SZ cars from VIN no.1001 to 9533 under airconditioning/compressor and fuse, it's on page 1 of 2 at the bottom and the price shown is Euros 55.95 incl vat.
regards David.

81 silver spirit
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post #6 of 33 (permalink) Old 04-06-2016, 12:09 PM
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Hi All
Just changed my receiver/dryer , what a pig of a job! fortunatly had the bonnet off for the water pump change otherwise I think albut impossible! , taken me all day! yes 3 bolts and 2 pipes ,**** stupid place to put it!
rant over
Mike

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post #7 of 33 (permalink) Old 05-03-2016, 04:56 PM
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There are "drop in" replacement gasses available for cars which originally used R12.

There are downsides to converting to R134a briefly:

You need to drain all the oil from the compressor (and as much as possible from the pipework etc) as the mineral oil used with R12 gas is not compatible with R134a.

As already stated R134a has very small molecules and you may find the old pipework and seals will leak.

R437a can be used as a direct drop in - no need to change the oil or pipework/seals etc. I would recommend changing the drier and if you need the car "regassing" because it is empty then you need to locate and fix the leak first. R437a is comparatively expensive when compared to R134a as there is little demand for it so budget for 50 per kg of gas needed (so 100 total cost to regas a car which requires 1kg).

At least you don't have a brand new car with the very latest gas 1234YF - this is VERY expensive at the moment at around 200 per kg!

I run an A/C business in the East Midlands and you can read up on classic vehicle Air Conditioning on my website (shameless plug) here: http://www.mistercool.co.uk/classic_..._rs24_r437.asp

If anybody has any A/C questions please ask I am happy to give endless free advice.

Justyn.
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post #8 of 33 (permalink) Old 05-05-2016, 09:55 AM
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Hi justyn
Do I need to strip down my compressor been empty of gas for years ,now I want to put R134a in?
Cheers
Mike
Ps gave your info to my mate,he needs 2 new rads in his boxter

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post #9 of 33 (permalink) Old 05-05-2016, 01:21 PM
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Hi Mike,

if you want to use R134a you need to replace the mineral oil in the compressor so you need to remove it and drain the oil - there is usually a "sump" plug bolt on the side of them. R134a uses PAG oil but that doesn't mix with mineral oil so you would be best using Polyolester (POE) oil.

Bear in mind R134a can attack the rubber o-rings (seals) everywhere that you have a joint and possibly the seals inside the compressor too. You will need a drier that is R134a compatible too.

If there is no gas in there bear in mind you could have a leak?

When you want it regassing with R134a bring it over I will do it for the cost of the gas plus you have to take me for a spin around the block. Likewise if you need help finding leaks etc just bring it over - no charge to you for anything apart from the cost of any materials used.

It's been over 20 degrees today and everyone starts suffering with their A/C not working. Had 2 Cayman owners and a Boxster owner from Duffield call me so far - is that your friend or is he yet to call?

Cheers!

Justyn.
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post #10 of 33 (permalink) Old 05-05-2016, 02:03 PM
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Hi justyn
That's great thanks ��
My mate is called Graham ok
I'll drain the compressor and make arrangements with you
Many thanks
Mike

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