Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1656
1-10 HEATING AND AIR CONDITIONING
REFRIGERATION SYSTEM (LHD MODEL)
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HEATING AND AIR CONDITIONING 1-11
REFRIGERATION SYSTEM (RHD MODEL)
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1-12 HEATING AND AIR CONDITIONING
SERVICING
This illustration is based on the LHD
model.
PRECAUTIONS FOR REFRIGERANT-134a
(R-134a) AIR CONDITIONING SYSTEM
Vehicles that use Refrigerant-134a (R-134a) in the air
conditioning system have a caution plate fixed to the rear wall
of the engine compartment. Also, components designed solely
for use with R-134a are so marked, to distinguish them from
components designed solely for use with Refrigerant-12 (R-
12).
R-12 and R-134a systems require different types of lubricating
oil. components designed solely for use with one refrigerant
and oil type must never by interchange with components
designed solely for use with another refrigerant and oil type.
R-134a Refrigerant:
•
R-134a differs entirely from R-12 in its composition and,
therefore, the two should never by mixed. Always charge
the specified amount of R-134a.
•
The pressure characteristics of R-134a differ from those of
R-12. The low pressure is lower, and the high pressure is
higher.
R-134a Compressor oil:
•
The R-134a system requires a synthetic (PAG) compressor
oil whereas the R-12 system requires a mineral compressor
oil. The two oils must never be mixed.
•
Compressor (PAG) oil varies according to compressor
model. Be sure to use oil specified for the model of
compressor.
Oil Specification
ZXL-100PG
(ISUZU PART NO. 8-97101-338-0)
HEATING AND AIR CONDITIONING 1-13
•
The PAG compressor oil for the R-134a system tends to
absorb moisture more quickly than mineral oil. When air
conditioning parts are removed for servicing, all the open
ends of parts and components must be sealed with caps to
keep out contaminants.
•
The PAG compressor oil must be stored in metal
containers, not in plastic containers.
Service charge valve:
•
The diameter of the service charge valve for the R-134a
system is made larger than that for the R-12 system to
prevent cross-contamination. In addition, the screw-in type
joint of the R-12 system Is replaced with a quick joint type in
the R-134a system.
•
To prevent refrigerant from escaping during installation and
removal of charging hoses from the service charge valves,
quick-joint type fittings are used.
Connection : Push on firmly until locked (a "click" will be
heard).
Removal
: Hold the grip-ring and pull to remove.
•
Air conditioning manifold gauges, charging hoses and other
service tools designed exclusively for the R-134a system
must be used with this vehicle.
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