Opel Frontera UE. Manual - part 620

 

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Opel Frontera UE. Manual - part 620

 

 

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

1A–37

D08RX150

1A–38

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Diagnosis

Air Conditioning Cycle Diagnosis

*For the execution of the charging and discharging
operation in the table above, refer to Recovery,
Recycling, Evacuating and Charging in this section.

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 loosened 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.

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

1A–39

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:

• Run the engine at Idling

• Air conditioning switch is “ON"

• Run the blower motor at “HIGH" position

• Temperature control lever set to “MAX COLD"

• Air source selector lever at “CIRC"

• Open the engine hood

• Close all the doors

• At ambient temperature: approx. 25–30

°

C (77–86

°

F).   

Normal Pressure:

• At low-pressure side: approx. 147.1–294.2 kPa

(21.3–42.7 psi).

• 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–40

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Connect The Manifold Gauge

Low-pressure hose (LOW) — Suction side
High pressure hose (HI) — Discharge side

901RX060

EndOFCallout

Legend

(1) High Side
(2) Low Side

 

 

 

 

 

 

 

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