Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 1661

1-30  HEATING AND AIR CONDITIONING

GENERAL REPAIR PROCEDURE

OIL SPECIFICATION

•

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.

Specified Compressor Oil

ZXL-100PG

(ISUZU PART NO.8-97101-338-0)

HANDLING OF OIL

•

The oil should be free from moisture, dust, metal powder,

etc.

•

Do not mix with other oil.

•

The water content in the oil increases when exposed to the

air.  After use, seal oil from air immediately.

(R-134a PAG Compressor Oil absorbs moisture very easily

than R-12.)

•

The compressor oil must be stored in steel containers, not

in plastic containers.

COMPRESSOR OIL CHECK

The Oil used to lubricate the compressor is circulating with the

refrigerant.

Whenever replacing any component of the system or a large

amount of gas leakage occurs, add oil to maintain the original

amount of. oil.

Oil Capacity

Capacity total in

system

DKS 15 CH

150 cc (5.0 fl.oz.)

Compressor

(Service parts)

charging amount

DKS 15 CH

150 cc (5.0 fl.oz.)

HEATING AND AIR CONDITIONING  1-31

Checking and Adjusting for Used Compressor

(1) Perform Oil return operation.

(Refer to "Oil Return Operation" in this section.)

(2) Discharge refrigerant and remove the compressor.

(3) Drain the compressor oil and measure the extracted oil with

a measuring cylinder.

(4) Check the compressor oil for contamination.

(Refer to "Contamination of Compressor Oil" in this

section.)

(5) Adjust oil level following the procedure below.

Type

Collected Amount

Charging Amount

more than 90 cc

(3.0 fl.oz.)

same as collected

amount

less than 90 cc

(3.0 fl.oz.)

90 cc (3.0 fl.oz.)

DKS-15 CH

(6) Install the compressor, then evacuate, charge and perform

oil return operation.

(7) Check system operation.

When it is impossible to perform oil return operation, the
compressor oil should be checked in the following order:
(1) Discharge refrigerant and remove the compressor.

(2) Drain the compressor oil and measure the extracted oil with

a measuring cylinder.

(3) Check the oil for contamination.

(4) If more than 90 cc (3.0 fl.oz.) for DKS-15 CH type is

extracted from the compressor, supply same amount of oil

to the compressor to be installed.

If the amount of oil extracted is less than 90 cc (3.0 fl.oz.)

for DKS-15 CH type recheck the compressor oil in the

following order:

(5) Supply 90 cc (3.0 fl.oz.) for DKS-15 CH type oil to the

compressor and install it onto the vehicle.

(6) Perform oil return operation.

(7) Remove the compressor and recheck the amount of oil.

(8) Adjust the compressor oil.

1-32  HEATING AND AIR CONDITIONING

Checking and Adjusting for Compressor
Replacement

150 cc (5.0 fl.oz.) for DKS-15 CH type of oil is charged in

compressor (service parts).

So it is necessary to drain the proper amount of oil from new

compressor.

(1) Perform oil return operation.

(2) Recover refrigerant and remove the compressor.

(3) Drain the compressor oil and measure the extracted oil with

a measuring cylinder.

(4) Check the compressor oil for contamination.

(5) Adjust oil level following the procedure below.

Type

Collected Amount

Charging Amount

more than 90 cc

(3.0 fl.oz.)

same as collected

amount

less than 90 cc

(3.0 fl.oz.)

90 cc (3.0 fl.oz.)

DKS-15 CH

(6) Evacuate, charge and perform oil return operation.

(7) Check system operation.

CONTAMINATION OF COMPRESSOR OIL

Unlike engine oil, no cleaning agent is added to the

compressor oil.  Even is the compressor runs for a long period

of time (approximately 1 season), the oil never becomes

contaminated as long as there is nothing wrong with the

compressor or its method of use.

Inspect the extracted oil for any of the following

conditions:

•

The capacity of the oil has increased.

•

The oil has changed color to red.

•

Foreign substances, metal powder, etc., are present in the

oil.

If any of these conditions exists, compressor oil is

contaminated.  Whenever contaminated compressor oil is

discovered, the receiver/drier must be replaced.

HEATING AND AIR CONDITIONING  1-33

OIL RETURN OPERATION

There is close affinity between the oil and the refrigerant.

During normal operation, part of the oil recirculates with the

refrigerant in the system.

When checking the amount of oil in the system, or replacing

any component of the system, the compressor must be run in

advance for oil return operation.  The procedure is as follows:

(1) Open the all doors and engine hood.

(2) Start the engine and A/C switch is "ON" and Set the fan

control knob at its highest position.

(3) Run the compressor for more than 20 minutes between 800

and 1,000 rpm in order to operate the system.

(4) Stop the engine.

REPLACEMENT OF COMPONENT PARTS

When replacing system component parts, supply the following

amount of oil to the component parts to be installed.

Component parts to be installed

Amount of oil

Evaporator

50 cc (1.7 fl.oz.)

Condenser

30 cc (1.0 fl.oz.)

Receiver/drier

30 cc (1.0 fl.oz.)

Refrigerant line (One piece)

10 cc (0.3 fl.oz.)

Refrigeration oil must be replenished if more than two parts

are removed at the same time.  After installing these

components, check compressor oil.