Nissan Versa
Sedan Service Manual
Ventilation, heater & air conditioner » Heater & air conditioning control system (HAC)
Insufficient heating

Description

Symptom

Insufficient heating
No warm air comes out. (Air flow volume is normal.)

Diagnosis Procedure

NOTE: Perform self-diagnosis with CONSULT before performing symptom diagnosis. If any malfunction result or DTC is detected, perform the corresponding diagnosis.

1.CHECK COOLING SYSTEM

Check engine coolant level and check for leakage. Refer to CO "Inspection".
Check radiator cap. Refer to CO "RADIATOR CAP : Inspection".
Check water flow sounds of the engine coolant. Refer to CO "Refilling Engine Coolant".

Is the inspection result normal?

YES >> GO TO 2.

NO >> Refill engine coolant and repair or replace the parts depending on the inspection results.

2.CHECK HEATER HOSE

Check installation of heater hose by visually or touching.

Is the inspection result normal?

YES >> GO TO 3.

NO >> Repair or replace parts depending on the inspection results.

3.CHECK HEATER CORE

Check temperature of inlet hose and outlet hose of heater core.
Check that inlet side of heater core is hot and the outlet side is slightly lower than/almost equal to the inlet side.

CAUTION: Always perform the temperature inspection in a short period of time because the engine coolant temperature is very hot.

Is the inspection result normal?

YES >> GO TO 4.

NO >> Replace heater core. Refer to HA "Removal and Installation".

4.CHECK AIR LEAKAGE FROM EACH DUCT

Check duct and nozzle, etc. of air conditioning system for air leakage.

Is the inspection result normal?

YES >> Check air mix door cable installation and air mix door operation.

NO >> Repair or replace parts depending on the inspection results.

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