A/C System - Flushing Procedure: Overview

88nissan05

Reference:
TECHNICAL BULLETIN TS88-076
Classification: Section: Heater &
HA88-007 Air Conditioner
Date:
May 19, 1988 Models:
All models
FLUSHING PROCEDURE

FOR AIR CONDITIONING SYSTEM


The following procedure should be used to flush an air conditioning system when there has been a failure that would leave contaminants in the system (for example, compressor failure or receiver drier failure). In addition, the receiver drier should be replaced whenever a system is flushed because it is not possible to remove contaminants from the receiver drier.

Two types of refrigerants are necessary to properly flush the A/C system. Refrigerant 11, referred to as R-11, has good solvent qualities and a boiling point of 75~F (at atmospheric presure). R-11 is available in 30-lb. orange canisters. Refrigerant 12, known as R-12 (Nissan part number 999MP-A4001), has a boiling point of -22~F (at atmospheric pressure), and is available in 30-lb. white canisters.

The basic flushing procedure consists of:
a) First flushing with R-11 liquid to flush and clean the components.
b) Second flushing with R-12 vapor to remove any residual R-11.

When reassembling components, use new O-rings at every location. Torque connections to proper specifications (refer to the HA section of the appropriate Service Manual), to insure a leak-free system.