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.