General Repair Procedure - Isuzu 2000 Trooper Workshop Manual

1A–48 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Pressure Switch
1. Disconnect pressure switch connector and check for
continuity between pressure switch side connector
terminals (1) and (2).

General Repair Procedure

Precautions For Replacement or Repair of
Air Conditioning Parts
There are certain procedures, practices and precautions
that should be followed when servicing air conditioning
systems:
D Keep your work area clean.
D Always wear safety goggles and protective gloves
when working on refrigerant systems.
D Beware of the danger of carbon monoxide fumes
caused by running the engine.
D Beware of discharged refrigerant in enclosed or
improperly ventilated garages.
D Always disconnect the negative battery cable and
discharge and recover the refrigerant whenever
repairing the air conditioning system.
D When discharging and recovering the refrigerant, do
not allow refrigerant to discharge too fast; it will draw
compressor oil out of the system.
D Keep moisture and contaminants out of the system.
When disconnecting or removing any lines or parts,
use plugs or caps to close the fittings immediately.
Never remove the caps or plugs until the lines or parts
are reconnected or installed.
D When disconnecting or reconnecting the lines, use
two wrenches to support the line fitting, to prevent
from twisting or other damage.
D Always install new O-rings whenever a connection is
disassembled.
D Before connecting any hoses or lines, apply new
specified compressor oil to the O-rings.
D When removing and replacing any parts which
require discharging the refrigerant circuit, the
operations described in this section must be
performed in the following sequence:
1. Use the J-39500 (ACR
Recovery / Recycling / Recharging / System) or
equivalent to thoroughly discharge and recover the
refrigerant.
2. Remove and replace the defective part.
3. After evacuation, charge the air conditioning
system and check for leaks.
Repair Of Refrigerant Leaks
Refrigerant Line Connections
Install new O-rings, if required. When disconnecting or
connecting lines, use two wrenches to prevent the
connecting portion from twisting or becoming damaged.
875RW003
When connecting the refrigerant line at a block joint,
securely insert the projecting portion of the joint portion
into the connecting hole on the unit side and secure with a
bolt. Apply the specified compressor oil to the O-rings
prior to connecting.
4 : HFC-134a Refrigerant
852RS003