Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 13
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–23
Air Conditioning Parts
852R200008
Legend
(1) Liquid Line (High-Pressure Pipe)
(2) Clip
(3) Discharge Line (High-Pressure Hose)
(4) Pressure Switch
(5) Receiver/Drier
(6) Condenser Air Guide
(7) Condenser & Receiver Tank Assembly
(8) Condenser Fan
(9) Compressor
(10) Suction Line (Low-Pressure Hose)
(11) Evaporator Assembly
1A–24 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Diagnosis
Air Conditioning Cycle Diagnosis
Condition
Possible cause
Correction
No cooling or insufficient cooling.
Magnetic clutch does not run.
Refer to
“Magnetic Clutch Diagnosis”
in this section.
Compressor is not rotating properly.
Drive belt is loose or broken.
Adjust the drive belt to the specified
tension or replace the drive belt.
Compressor is not rotating properly.
Magnetic clutch face is not clean and
slips.
Clean the magnetic clutch face or
replace.
Compressor is not rotating properly.
Incorrect clearance between
magnetic drive plate and pulley.
Adjust the clearance. Refer to
Compressor in this section.
Compressor is not rotating properly.
Compressor oil leaks from the shaft
seal or shell.
Replace the compressor
Compressor is not rotating properly.
Compressor is seized.
Replace the compressor
Insufficient or excessive charge of
refrigerant.
Discharge and recover the
refrigerant. Recharge to the
specified amount.
Leaks in the refrigerant system.
Check the refrigerant system for
leaks and repair as necessary.
Discharge and recover the
refrigerant. Recharge to the
specified amount.
Condenser is clogged or insufficient
radiation.
Clean the condenser or replace as
necessary.
Temperature control link unit of the
heat unit is defective.
Repair the link unit.
Unsteady operation due to a foreign
substance in the expansion valve.
Replace the expansion valve.
Poor operation of the electronic
thermostat.
Check the electronic thermostat and
replace as necessary.
Insufficient velocity of cooling air.
Evaporator clogged or frosted.
Check the evaporator core and
replace or clean the core.
Air leaking from the cooling unit or air
duct.
Check the evaporator and duct
connection, then repair as
necessary.
Blower motor does not rotate
properly.
Refer to
Fan Control Lever (Fan
Switch) Diagnosis in this section.
*For the execution of the charging and discharging
operation in the table above, refer to
Recovery,
Recycling, Evacuating and Charging in this section.
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–25
Checking The Refrigerant System With Manifold Gauge
Since Refrigerant-134a (HFC-134a) is used in the air
conditioning system in this vehicle, be sure to use
manifold gauges, charging hoses and other air
conditioning service tools for HFC-134a when
checking the refrigerant system.
Conditions:
D
Run the engine at idle
D
Air conditioning switch is “ON”
D
Run the blower motor at “HIGH” position (5 positions)
D
Temperature control set to “MAX COLD” (65
°
F)
D
Air source selector at “CIRC”
D
Open the engine hood
D
Close all the doors
Normal Pressure:
D
At ambient temperature: approx. 25–30
°
C
(77–86
°
F).
D
At low-pressure side: approx. 147.1–294.2 kPa
(21.3–42.7 psi).
D
At high-pressure side: approx. 1372.9–1863.3 kPa
(199.1–270.2 psi).
Refer to the table on the refrigerant pressure-temperature
relationship.
HFC-134a Pressure-Temperature Relationship
Pressure
Temperature
(kPa)
(psi)
(
°
C)
(
°
F)
36
5.3
–20
–4.4
67
9.7
–15
5
104
15
–10
14
147
21
–5
23
196
28
0
32
255
37
5
41
314
45
10
50
392
57
15
59
471
68
20
68
569
82
25
77
677
98
30
86
785
114
35
95
912
132
40
104
1059
154
45
113
1216
176
50
122
1A–26 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Connect The Manifold Gauge
Low-pressure hose (LOW) — Suction side
High pressure hose (HI) — Discharge side
901R100020
Legend
(1) Low Side
(2) High Side
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