Heater And Ventilation Symptom Diagnosis - Suzuki GRAND VITARA Owner's Manual

7A-8 Heater and Ventilation:

Heater and Ventilation Symptom Diagnosis

Condition
Blower won't work even
when blower speed
selector is ON
Air temperature is not
changed even when
temperature selector is
changed
Air outlet port is not
changed when air flow
selector is changed
No fresh air inlet is
changed.
Possible cause
Blower fuse blown
Blower motor faulty
Blower motor relay faulty
Blower motor controller faulty
Blower speed selector faulty
Wiring or grounding faulty
Temperature control door broken
Linkage broken
Heater hoses leaking or clogged
Heater core leaking or clogged
Temperature control actuator faulty
Temperature selector faulty
Air flow control door broken
Linkage broken
Air flow control actuator faulty
Mode selector faulty
Fuse blown
Air intake control actuator faulty
Air intake control door broken
Linkage broken
Air intake selector faulty
Wiring or grounding faulty
Correction / Reference Item
Replace fuse to check for short.
Check blower motor referring to "Blower Motor
Inspection: ".
Check relay referring to "Blower Motor Relay
Inspection: ".
Check blower motor controller referring to
"Blower Motor Controller Inspection: ".
Check HVAC control module referring to
"HVAC Control Module and Its Circuits
Inspection (for Vehicle without A/C): " or
"HVAC Control Module and Its Circuits
Inspection: in Section 7B".
Repair as necessary.
Repair Temperature control door.
Check actuator linkage referring to "Actuator
Linkage Inspection: ".
Replace hoses.
Replace heater core referring to "Heater Core
Removal and Installation: ".
Check temperature control actuator referring to
"Temperature Control Actuator Inspection: ".
Check HVAC control module referring to
"HVAC Control Module and Its Circuits
Inspection (for Vehicle without A/C): " or
"HVAC Control Module and Its Circuits
Inspection: in Section 7B".
Repair air flow control door.
Check actuator linkage referring to "Actuator
Linkage Inspection: ".
Check air flow control actuator referring to "Air
Flow Control Actuator Inspection: ".
Check HVAC control module referring to
"HVAC Control Module and Its Circuits
Inspection (for Vehicle without A/C): " or
"HVAC Control Module and Its Circuits
Inspection: in Section 7B".
Check related fuses and check for short circuit
to ground.
Check air intake control actuator.
Repair air intake control door.
Check actuator linkage referring to "Actuator
Linkage Inspection: ".
Check HVAC Control module referring to
"HVAC Control Module and Its Circuits
Inspection (for Vehicle without A/C): " or
"HVAC Control Module and Its Circuits
Inspection: in Section 7B".
Repair or replace as necessary.
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