Suzuki Grand Vitara JB416 / JB420. Manual — part 284

7B-27 Air Conditioning System:

A/C System Symptom Diagnosis

S5JB0A7204001

Condition

Possible cause

Correction / Reference Item

No cool air comes out (A/
C system does not
operate)

No refrigerant

Perform recovery, evacuation and charge
referring to “Operation Procedure for Charging
A/C with Refrigerant”.

Fuse blown

Check related fuses, and then check for short
circuit to ground.

Evaporator temperature sensor faulty

Check evaporator temperature sensor
referring to “A/C Evaporator Temperature
Sensor Inspection”.

A/C refrigerant pressure sensor faulty

Check A/C refrigerant pressure sensor
referring to “A/C Refrigerant Pressure Sensor
and Its Circuit Inspection”.

Wiring or grounding faulty

Repair as necessary.

ECT sensor faulty

Check ECT sensor referring to “Engine
Coolant Temperature (ECT) Sensor Inspection
in Section 1C”.

ECM faulty

Check ECM referring to “A/C System
Inspection at ECM”.

HVAC control module faulty

Check HVAC control module referring to
“HVAC Control Module and Its Circuits
Inspection”.

Magnet clutch faulty

Check magnet clutch referring to “Magnet
Clutch Operating Check for M16 Engine
Model” or “Magnet Clutch Operating Check for
J20 Engine Model”.

Compressor drive belt loosened or
broken

Adjust or replace drive belt.

Compressor faulty

Check compressor.

Compressor relay faulty

Check compressor relay referring to “A/C
Compressor Relay Inspection”.

Temperature selector, blower speed
selector, and/or air flow selector faulty

Check HVAC control module referring to
“HVAC Control Module and Its Circuits
Inspection”.

BCM faulty

Check BCM referring to “Inspection of BCM
and its Circuits in Section 10B”.

No cool air comes out
(radiator cooling fan
motor does not operate)

Fuse blown

Check related fuses, and then check for short
circuit to ground.

Wiring or grounding faulty

Repair as necessary.

Radiator cooling fan motor relay faulty

Check radiator cooling fan motor relay
referring to “Radiator Cooling Fan Relay
Inspection in Section 1F”.

Radiator cooling fan motor faulty

Check radiator cooling fan motor referring to
“Radiator Cooling Fan Motor On-Vehicle
Inspection in Section 1F”.

ECM faulty

Check ECM referring to “A/C System
Inspection at ECM”.

HVAC control module faulty

Check HVAC control module referring to
“HVAC Control Module and Its Circuits
Inspection”.

Air Conditioning System: 7B-28

No cool air comes out
(blower motor does not
operate)

Fuse blown

Check related fuses, and then check for short
circuit to ground.

Blower motor controller faulty

Check blower motor controller referring to
“Blower Motor Controller Inspection in Section
7A”.

Blower speed selector faulty

Check blower speed selector referring to
“HVAC Control Module and Its Circuits
Inspection”.

HVAC control module faulty

Check HVAC control module referring to
“HVAC Control Module and Its Circuits
Inspection”.

Wiring or grounding faulty

Repair as necessary.

Blower motor faulty

Check blower motor referring to “Blower Motor
Inspection in Section 7A”.

Blower motor relay faulty

Check blower motor relay referring to “Blower
Motor Relay Inspection in Section 7A”.

Cool air does not come
out or insufficient cooling
(A/C system normal
operation)

Insufficient or excessive charge of
refrigerant

Check the amount of refrigerant and system
for leaks.

Condenser clogged

Check condenser referring to “A/C Condenser
Assembly On-Vehicle Inspection”.

A/C evaporator clogged or frosted

Check A/C evaporator and evaporator
temperature sensor referring to “A/C
Evaporator Inspection” and “A/C Evaporator
Temperature Sensor Inspection”.

Evaporator temperature sensor faulty

Check evaporator temperature sensor
referring to “A/C Evaporator Temperature
Sensor Inspection”.

Expansion valve faulty

Check expansion valve referring to “Expansion
Valve On-Vehicle Inspection”.

Desiccant clogged

Check desiccant.

Compressor drive belt loosened or
broken

Adjust or replace drive belt.

Magnet clutch faulty

Check magnet clutch referring to “Magnet
Clutch Operating Check for M16 Engine
Model” or “Magnet Clutch Operating Check for
J20 Engine Model”.

Compressor faulty

Check compressor.

Air in A/C system

Replace desiccant, and then perform
evacuation and charge referring to “Operation
Procedure for Charging A/C with Refrigerant”.

Air leaking from HVAC unit or air duct

Repair as necessary.

Heater and ventilation system faulty

Check HVAC unit.

Temperature selector faulty

Check temperature selector referring to “HVAC
Control Module and Its Circuits Inspection”.

HVAC control module faulty

Check HVAC control module referring to
“HVAC Control Module and Its Circuits
Inspection”.

Temperature control actuator faulty

Check temperature control actuator referring to
“Temperature Control Actuator Inspection”.

Blower motor faulty

Check blower motor referring to “Blower Motor
Inspection in Section 7A”.

Excessive compressor oil in A/C system Drain excessive compressor oil from A/C

system circuit and compressor.

Condition

Possible cause

Correction / Reference Item

7B-29 Air Conditioning System:

Abnormal Noise Diagnosis

S5JB0A7204002

There are various types of noise, ranging from those produced in the engine compartment to those from the
passenger compartment, also from rumbling noises to whistling noises.

Abnormal Noise Symptom Diagnosis of A/C System

S5JB0A7204026

Abnormal Noise from Compressor

Cool air does not come
out only intermittently

Wiring connection faulty

Repair as necessary.

Expansion valve faulty

Check expansion valve referring to “Expansion
Valve On-Vehicle Inspection”.

Excessive moisture in A/C system

Replace desiccant, and then perform
evacuation and charge referring to “Operation
Procedure for Charging A/C with Refrigerant”.

Magnet clutch faulty

Check magnet clutch referring to “Magnet
Clutch Operating Check for M16 Engine
Model” or “Magnet Clutch Operating Check for
J20 Engine Model”.

Excessive amount of refrigerant

Check the amount of refrigerant.

Cool air comes out only at
high speed

Condenser clogged

Check condenser referring to “A/C Condenser
Assembly On-Vehicle Inspection”.

Insufficient charge of refrigerant

Check the amount of refrigerant and system
for leaks.

Air in A/C system

Replace desiccant, and then perform
evacuation and charge referring to “Operation
Procedure for Charging A/C with Refrigerant”.

Compressor drive belt loosened or
broken

Adjust or replace drive belt.

Compressor faulty

Check compressor.

Cool air does not come
out only at high speed

Excessive amount of refrigerant

Check the amount of refrigerant.

A/C evaporator frosted

Check A/C evaporator and evaporator
temperature sensor referring to “A/C
Evaporator Inspection” and “A/C Evaporator
Temperature Sensor Inspection”.

Insufficient air flow of
cooled air

A/C evaporator clogged or frosted

Check A/C evaporator and evaporator
temperature sensor referring to “A/C
Evaporator Inspection” and “A/C Evaporator
Temperature Sensor Inspection”.

Air leaking from HVAC unit or air duct

Repair as necessary.

Blower motor faulty

Check blower motor referring to “Blower Motor
Inspection in Section 7A”.

Wiring or grounding faulty

Repair as necessary.

Condition

Possible cause

Correction / Reference Item

Condition

Possible cause

Correction / Reference Item

During compressor
operation, a rumbling
noise is heard
proportional to engine
revolutions

Inadequate clearance in scroll area

Replace compressor.

A loud noise is heard at a
certain rpm,
disproportionately to
engine revolution

Loose or faulty compressor drive belt

Adjust drive belt tension or replace drive belt.

Loose compressor mounting bolts

Retighten mounting bolts.

A loud rattle is heard at
low engine rpm

Loose compressor armature plate bolt

Retighten armature plate bolt.
Replace compressor if it was operated in this
condition for a long time.

Air Conditioning System: 7B-30

Abnormal Noise from Magnetic Clutch

Abnormal Noise from Tubing

Abnormal Noise from Condenser Assembly

Abnormal Noise from Crankshaft Pulley

Abnormal Noise from Tension Pulley

Abnormal Noise from A/C Evaporator

Abnormal Noise from Blower Motor

Condition

Possible cause

Correction / Reference Item

A rumbling noise is heard
when compressor is not
in operation

Worn or damaged bearings

Replace magnet clutch assembly.

A chattering noise is
heard when compressor
is in operation

Faulty magnet clutch clearance
(excessive clearance)

Adjust magnet clutch clearance.

Worn magnet clutch friction surface

Replace magnet clutch assembly.

Compressor oil leaked from shaft seal,
contaminating the friction surface

Replace compressor body assembly.

Condition

Possible cause

Correction / Reference Item

A droning noise is heard
from inside of the vehicle,
but not particularly
noticeable in engine
compartment

Faulty tubing clamps

Reposition clamps or increase the number of
clamps.

Resonance caused by pulsation from
variations in refrigerant pressure

Attach a silencer to tubing, or modify its
position and length.

Condition

Possible cause

Correction / Reference Item

Considerable vibration in
condenser assembly

Resonance from condenser assembly
bracket and body

Firmly insert a silencer between condenser
assembly bracket and body.

Condition

Possible cause

Correction / Reference Item

A large rattling noise is
heard at idle or sudden
acceleration

Loosen crankshaft pulley bolt

Retighten bolt.

Condition

Possible cause

Correction / Reference Item

Clattering noise is heard
from pulley

Worn or damaged bearing

Replace tension pulley.

Pulley cranks upon
contact

Cracked or loose bracket

Replace or retighten bracket.

Condition

Possible cause

Correction / Reference Item

Whistling sound is heard
from A/C evaporator

Depending on the combination of the
interior / exterior temperatures, engine
rpm and refrigerant pressure, the
refrigerant flowing out of the expansion
valve may, under certain conditions,
make a whistling sound

At times, slightly decreasing refrigerant volume
may stop this noise.
Inspect expansion valve and replace if faulty.

Condition

Possible cause

Correction / Reference Item

Blower motor emits a
chirping sound in
proportion to its speed of
rotation

Worn or damaged motor brushes or
commutator

Replace blower motor.

Fluttering noise or large
droning noise is heard
from blower motor

Leaves or other debris introduced from
fresh air inlet to blower motor

Remove debris and make sure that the screen
at fresh air inlet is intact.