Celica Liftback L4-122 1998cc 2.0L DOHC Turbo (3S-GTE) (1992)
A/C Coupler O-ring: Technical Service Bulletins
A/C - R12 and R134A O-Ring Color Identification
REF:
HEATING & AIR CONDITIONING
NO:
AC92-004
DATE:
OCTOBER 9, 1992
MODEL:
ALL MODELS
AIR CONDITIONER SYSTEM O-RING COLOR CHANGE
With the change-over to new air conditioning refrigerant R134a (HFC134a), there is a need to distinguish between R12 and R134a O-rings.
Beginning with May, 1992 production, the color of R12 O-rings has been changed from black to brown. The following charts describe O-ring color and
material application for both R12 and R134a systems.
NBR: Nitrile Butadiene Rubber
H-NBR: Hydrated Nitrile Butadiene Rubber
NOTE:
Part Numbers remain unchanged.
RBR: Rubber used in HFC134a systems
SERVICE HINT:
There will be a transition period where both black and brown R-12 O-Rings are in distribution. You are advised to use up your current stock as well as
additional stock of Black R-12 O-Rings first. This will help prevent confusion when R134a systems are introduced.