Hi,
I’ve placed an order for the conversion kit from R12 to R134A gas
on AC for my 1990 XJ40 Daimler. Anyone with experience as to what
the work entails?
Regards,–
Bard Thomas Hesvik - Jaguars XJ12 Series I/III/XJ40 +Daimler
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In reply to a message from Bard Th Hesvik sent Fri 27 Apr 2007:
This is what I was told by the aircon guy who serviced the R134a
system on my car. This is from memory so gas types may need to be
double checked. You dont need to convert to R134a as there is a
replacement gas available for R12 systems it is R413a and is a
legal replacement (in UK at least) but is more expensive than
R134a. I have heard that R413a gives better performance than R134a
in a R12 system. there are also other gasses that can be used
(isceon 49 same as R413 or R24a recomended for converted systems).
If you do convert to R134a you will need to take it to an aircon
shop as it will need to be evacuated and vacumed out to completely
to remove all traces of oil and R12 then the correct amount of pag
oil and refrigerant added. It may be wise to consult an aircon shop
anyway to see wich is the best option. You can top up R134a systems
yourself but there are certain conditions to be met I will post
this seperate later.–
The original message included these comments:
I’ve placed an order for the conversion kit from R12 to R134A gas
on AC for my 1990 XJ40 Daimler. Anyone with experience as to what
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–
John Hickman 1994MY UK 1993reg sovereign 4.0
West Midlands, United Kingdom
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Hi Bard,
I’ve converted from R-12 to R-134a on all of mine, and several other
vehicles. In the US, the conversion kits contain two cans of R-134a, a
3 oz. can of PAG oil (2 oz. of oil & 1 oz. of propellant),
quick-connect R-134a fittings for high & low side Schrader valves, and
a charging handle to fit to the R-134a cans.
If your system has recently worked on R-12, and has NOT been left
exposed to the atmosphere due to a ruptured hose, etc., and you have
NOT had a component failure such as the compressor seizing which can
put debris into the system and plug other components such as the
expansion valve, then conversion is easy.
All you need to do is remove the R-12 (local law may require it being
pumped out by a shop); put a vacuum pump on the system for 15 to 30
minutes; let it sit for an hour or so to see if it holds vacuum; add
the 2 oz. of PAG oil (the original mineral oil will remain in the
system, resident in the compressor sump, condenser, etc. and NOT
removed by the evacuation); and then add ~ 30 oz. of R-134a. I use a
$10 air vacuum pump that is driven off compressed air. If you have air
tools and a compressor, this is a cheap do-it-yourself solution. It
cannot provide as deep a vacuum as a $200-$300 vacuum pump, but it
provides very satisfactory results.
If you have a sight glass on your receiver-dryer, watch for reduction
of bubbles as the R-134a is added. You can add the first can without
the compressor running, to get enough system pressure to make the
compressor pressure switch engage the compressor clutch, and then start
the engine and have the compressor running to add the rest (another 1
to 1.5 cans) of the refrigerant.
Before you evacuate the system, you might be wise to replace the
o-rings at the rear of the compressor (where the refrigerant lines
attach to the back of the compressor) and at the expansion valve at the
firewall, simply because these tend to fail with age. You might also
wish to replace the receiver-dryer, particularly if you have had to
open the system to replace o-rings, hoses, etc., and NEVER leave the
system open to the atmosphere; ALWAYS put plugs/caps on any
disconnected fittings.
George Balthrop, Clifton, VA USA
85 & 89 XJ-S Coupes; 89 XJ40 VDP-----Original Message-----
From: bard.hesvik@hotmail.com
I’ve placed an order for the conversion kit from R12 to R134A gas
on AC for my 1990 XJ40 Daimler. Anyone with experience as to what
the work entails?
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In reply to a message from Bard Th Hesvik sent Fri 27 Apr 2007:
The best conversion from R12 to R134a requires a compressor
oil change and a new reciever/drier.
R12 systems use mineral oil and that oil does not agree with
R134a very well, worse, R12 has clorine in it and some of
that clorine goes into solution with the oil and if left in
a R134a system, will react badly. Best case is the
compressor life is severely shortened.
Best thing to do is to remove the compressor, drain then
flush the old oil out. Replace the filter/drier/reciever,
charge with Ester (POE) oil and then pull a deep vacuum.
Once you’ve got a good vacuum, charge with R134a – approx
40 oz or so.
When charging the system, look for approx 220 psi on the
high side (ensure good airflow across the
condensor/radiator), and 40 or so on the low.
My '91 gets darn cold even with the summer temps here in
Tampa FL, at least as cold as the larger capacity system on
my '93 with simular pressures.
Ester oil is very hydroscopic (wants to absorb water) and
needs to be from a newly opened container. It’s advantage
is it does mix better with mineral oil than PAG oil.–
91 XJ6, 93 Sov, 97 Sov – Driveway’s crowded!
Tampa Fl, United States
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In reply to a message from gbalthropxjs@aol.com sent Fri 27 Apr 2007:
PMJI, but does anyone know of an adapter to convert the old
R14 schrader valves to the more modern R134a connectors?
I know I can buy replacement valves, but they all seem to
require removing the old valve and installing a new one,
losing all the gas in the process.
What I am looking for is an adapter that screws (or
whatever) onto the old schrader valve in-place allowing
modern aircon top-up cylinders to connect.
I just want to add a few ounces of R134a to bring my a/c up
to top condition.
Searching the web I think I’ve found such devices in the US
but can’t find anything available in the UK.–
Mike. '92 Soverign 4.0 RHD
London, SW17, United Kingdom
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Hi Mike,
“Adapters” which screw onto the existing R-12 Schrader valves, and
allow R-134a charging handles and gauges to be fitted via the
“quick-connect” fittings are very common in the US, and I would assume
also available at good auto parts stores in the UK. Four Seasons, a
division of Standard Motor Products, is one producer/supplier of such
parts. In the US, those adapters are included in R-134a conversion
kits, as well as being available separately from good auto parts stores.
George Balthrop, Clifton, VA USA
85 & 89 XJ-S Coupes; 89 XJ40 VDP-----Original Message-----
From: michael.higham@virgin.net
PMJI, but does anyone know of an adapter to convert the old
R14 schrader valves to the more modern R134a connectors?
I know I can buy replacement valves, but they all seem to
require removing the old valve and installing a new one,
losing all the gas in the process.
What I am looking for is an adapter that screws (or
whatever) onto the old schrader valve in-place allowing
modern aircon top-up cylinders to connect.
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from AOL at AOL.com.
Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !