By Bob PoggiPage 2 of 2
|Upgrading Your Porsche Air Conditioner
Porsche air conditioning systems consist of five major components; the compressor, condenser, orifice expansion valve, evaporator and accumulator-dehydrator. These components perform the following functions.
The introduction of HFC R-134a refrigerant has solved the environmental problems of CFC R-12, yet there are new issues, which have to be considered. Initial testing of HFC R-134a has shown that it requires higher operating pressures than that of CFC R-12 because it is less active than R-12. I his results in the gas changing to a liquid at a slower rate. As a result, we are confronted with differences, which have to be addressed when retrofitting the system.
|The condenser of certain water-cooled Porsche
models (924/944/ 968/928) may have inadequate condenser capacity with space limitations
for expanding it. That may restrict the use of a larger condenser. The automotive A/C
industry has come up with a new condenser design called "Parallel Flow" which
has increased capacity without increasing size. This condenser works on the same principle
as a car radiator rather than an A/C condenser.
Porsche 911/912/914/930 models, being air cooled, create problems with the condenser being exposed not only to engine heat, but also the use of multiple condensers. These condensers are mounted in remote locations. The use of high performance parallel-flow condensers and cooling fans will add to the condensing capacity.
The A/C hoses may also need to be replaced with a new barrier-type. The new R-134a gas will permeate older A/C hoses. When upgrading your Porsche's A/C, check hoses to see that they are labeled Barrier. Only barrier-type hoses will work with R-134a systems. Earlier model Porsches do not have barrier-type hoses (they began to be phased in around 1990).
|Some A/C systems, after they are upgraded, may
operate at 4-6" high vent outlet temperatures. It may be necessary to change
thermostat settings expand valve orifice sizes to offset
NEW A/C RETROFIT KITS - Converter R-12 to R134a -Environmental Upgrades Now available
ICE Inc., a company that has been manufacturing and servicing automotive air-conditioning systems for 36 years. Located in San Diego. ICE Inc., provides both informative data pertinent to the environmentally safe retrofitting of A/Cs as well as upgrade kits to all makes and models of automobiles.
NEW A/C RETROFIT KITS Convert your R-12 to R134a Environmental Upgrades Now Available.
ICE TECH LINK
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