Isuzu Rodeo UE. Manual - part 20

1A–50 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

3. Connect the low pressure charging hose of the

manifold gauge to the low pressure side service valve
of the vehicle.

4. Connect the high pressure charging hose of the

manifold gauge to the high pressure side service
valve of the vehicle.

901RS184

Legend

(1) Low Side
(2) High Side
(3) Refrigerant Container
(4) Weight Scale

5. Place the refrigerant container(3) up right on a weight

scale(4).
Note the total weight before charging the refrigerant.

a. Open the refrigerant container valve.
b. Open the low side vale on the manifold gauge set.

Refer to the manufacturer’s instructions for a
weight scale charging station.

901RS144

6. Perform a system leak test:

f

Charge the system with approximately 200 g
(0.44 lbs) of HFC-134a.

f

Make sure the high pressure valve of the manifold
gauge is closed.

f

Check to ensure that the degree of pressure does
not change.

f

Check for refrigerant leaks by using a HFC-134a
leak detector.

f

If a leak occurs, recover the refrigerant. Repair the
leak and start all over again from the first step of
evacuation.

7. If no leaks are found, continue charging refrigerant to

the air conditioning system.

f

Charge the refrigerant until the scale reading
decreases by the amount of the charge specified.

Specified amount: 650 g (1.43 lbs)

f

If charging the system becomes difficult:

1. Run the engine at idle and close all the vehicle

doors.

2. Turn A/C switch “ON”.
3. Set the fan switch to its highest position.
4. Set the air source selector lever to “CIRC”.
5. Slowly open the low side valve on the manifold

gauge set.

WARNING: BE ABSOLUTELY SURE NOT TO OPEN
THE HIGH PRESSURE VALVE OF THE MANIFOLD
GAUGE. SHOULD THE HIGH PRESSURE VALVE BE
OPENED, THE HIGH PRESSURE REFRIGERANT
WOULD FLOW BACKWARD, AND THIS MAY CAUSE
THE REFRIGERANT CONTAINER TO BURST.

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–51

8. When finished with the refrigerant charging, close the

low pressure valve of the manifold gauge and
container valve.

9. Check for refrigerant leaks.

Checking The A/C System

1. Run the engine and close all the vehicle doors.
2. Turn A/C switch “ON”, set the fan switch to its highest

position.

3. Set the air source lever to “CIRC”, set the

temperature lever to the full cool position.

4. Check the high and low pressure of the manifold

gauge.

f

Immediately after charging refrigerant, both high
and low pressures might be slightly high, but they
settle down to the pressure guidelines shown
below:

f

The ambient temperature should be between
25–30

°

C (77–86

°

F).

f

The pressure guideline for the high-pressure side is
approximately 1372.9–1863.3 kPa (199.1–270.2
psi).

f

The pressure guideline for the low-pressure side is
approximately 147.1–294.2 kPa (21.3–42.7  psi).

f

If an abnormal pressure is found, refer to Checking
The Refrigerant System With Manifold Gauge in
this section.

5. Put your hand in front of the air outlet and move the

temperature control lever of the control panel to
different positions.  Check if the outlet temperature
changes as selected by the control knob.

1A–52 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Compressor Assembly

Compressor Assembly and Associated Parts

871RX004

Legend

(1) Magnetic Clutch Harness Connector
(2) Refrigerant Line Connector

(3) Compressor
(4) Serpentine Belt

Removal

1. Disconnect the battery ground cable.
2. Discharge and recover refrigerant

f

Refer to Refrigerant Recovery in this section.

3. Disconnect magnetic clutch harness connector.

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–53

4. Remove serpentine belt.

f

Move serpentine belt tensioner to loose side using
wrench then remove serpentine belt.

850RW001

Legend

(1) Crankshaft Pulley
(2) Cooling Fan Pulley
(3) Tensioner
(4) Generator
(5) Air Conditioner Compressor
(6) Power Steering Oil Pump
(7) Serpentine Belt

5. Disconnect refrigerant line connector.

f

When removing the line connector, the connecting
part should immediately be plugged or capped to
prevent foreign matter from being mixed into the
line.

6. Remove compressor.

Installation

1. Install compressor.

f

Tighten the compressor fixing bolts to the specified
torque.

Torque: 19 N

•

m (14 lb

•

ft)

2. Connect refrigerant line connector.

f

Tighten the refrigerant line connector fixing bolts to
the specified torque.

Torque: 15 N

•

m (11 lb

•

ft)

f

O-rings cannot be reused. Always replace with new
ones.

f

Be sure to apply new compressor oil to the O-rings
when connecting refrigerant lines.

3. Install serpentine belt.

f

Move serpentine belt tensioner to loose side using
wrench, then install serpentine belt to normal
position.

4. Connect magnetic clutch harness connector.

New Compressor Installation

The new compressor is filled with 150cc (5.0fl.oz.)of
compressor oil and nitrogen gas. When mounting the
compressor on the vehicle, perform the following steps;

1. Gently release nitrogen gas from the new

compressor.

f

Take care not to let the compressor oil flow out.

f

Inspect O-rings and replace if necessary.

871RX005

2. Turn the compressor several times by hand and

release the compressor oil in the rotor.

3. When installing on a new system, the compressor

should installed as it is. When installing on a used
system, the compressor should be installed after
adjusting the amount of compressor oil. (Refer to
Compressor in this section)

871RX003