A/C - Retrofitting R12 Systems to R134: Overview

Group
8

Model
All

Part Identifier
8717

Number
9501

December 19, 1995

Subject
Retrofitting R12 A/C System to Refrigerant R134

ATTENTION: Service Manager / Service Technician

Models Affected:
All

Concern:
Retrofitting of R12 air conditioning systems to refrigerant R134a (formerly R12).

General Information:
As of January 1, 1995, (January 1,1996 for USA) production of refrigerant R12 containing CFC substances is no longer permitted in accordance with legislation in the European Union and several other countries and will be made illegal (with specific exceptions) worldwide in the near future. Starting with Model Year '93 (P), all air conditioning systems of new Porsche vehicles are factory charged with non-CFC refrigerant R134a. The formerly used refrigerant R12 was phased out at the same time. A new type of refrigerant oil, ND-Oil 8, must be used in conjunction with refrigerant R134a. This refrigerant oil is of a synthetic type. The formerly used refrigerant oil based on mineral oils will not mix with the ND-Oil 8 refrigerant oil required for R134a.

Due to the chemical properties of the new refrigerant R134a and of the new refrigerant oil, modifications to the materials of various components exposed to refrigerant oil have become necessary.

The maximum refrigerant and refrigerant oil capacities are changed in this retrofitting process!

Retrofitting:
In most cases, older vehicles fitted with air conditioners charged with R12 refrigerant containing CFC can be converted without any major problems.

It is the responsibility of the dealer/retrofitting agent to maintain A/C system integrity during the retrofitting process.

It is of particular importance to draw off the R12 refrigerant and refrigerant oil charge. Recycling service equipment should be used for this purpose and to separate the refrigerant oil from the refrigerant.

Retrofitting operations should only be performed by qualified personnel in Porsche workshops. After retrofitting, a sticker should be attached near the compressor and in the Maintenance Booklet to confirm that retrofitting has been performed according to specifications. This technical information provides you with an overview of the required scope of operations and parts requirements for retrofitting air conditioners to non-CFC refrigerant R134a.

Warranty Information:
A two year parts warranty without mileage limitations applies to all Genuine Porsche parts used for retrofitting.

The dealer warrants the A/C system integrity, correct installation and execution of all retrofitting operations.





944-Model Years 1983 to 1985/1





944, 944S, 944 Turbo - Model Years 1985/2 to 1991 924S, Model Years 1987, 88





968 Model Year 1992





911 Carrera - Model Year 1984 to 1989





911 Carrera 2/4 - Model Years 1989 to 1992





911 Turbo Model Years 1986 to 1989





911 Turbo - Model Years 1991 and 1992





928, 928S-Model Years 1983 to 1986





928 S4, 928 GT - Model 1987 to 1989





928 S4, 928 GT, 928 GTS - Model Year 1990 to 91

Repair Information:
Refer to the appropriate workshop manual, Group 87.

Repair Times:
350 TU Covering: Retrofitting air conditioning system to refrigerant R134a, All Models - replace receiver dryer without compressor removal.