Nissan Maxima Service and Repair Manual: Insufficient heating
Component Function Check
Symptom
- Insufficient heating
- No warm air comes out. (Airflow volume is normal.)
INSPECTION FLOW
1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE INCREASE
- Press the AUTO switch.
- Turn temperature control switch (driver side) clockwise until 32C
(90F) is displayed.
- Check for hot air at discharge air outlets.
2. CHECK FOR ANY SYMPTOMS
Perform a complete operational check and check for any symptoms.
3. CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
4. CHECK ENGINE COOLING SYSEM
- Check for proper engine coolant level. Refer to CO-10, "System
Inspection".
- Check hoses for leaks or kinks.
- Check radiator cap. Refer to CO-10, "System Inspection".
- Check for air in cooling system.
5.CHECK SETTING OF TEMPERATURE SETTING TRIMMER
Using CONSULT, check the setting of "TEMP SET CORRECT" on "WORK SUPPORT" of
HVAC.
- Check that the temperature setting trimmer is set to "− direction".
NOTE:
The control temperature can be set by the temperature setting trimmer.
- Set temperature control dial to "0".
6.CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT
- Using CONSULT, perform "SELF-DIAGNOSIS RESULTS" of HVAC.
- Check if any DTC No. is displayed in the trouble diagnosis
results.
NOTE:
If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000
or U1010.
7.CHECK WITH ACTIVE TEST OF CONSULT
- Using CONSULT, perform "HVAC TEST" in "ACTIVE TEST" of HVAC to
check each output device. Refer
to HAC-129, "CONSULT Function".
NOTE:
Perform the ACTIVE TEST after starting the engine because the A/C compressor
is operating.
- Refer to the table and check the outlet, inlet, airflow temperature,
blower motor control signal, magnet
clutch operation, and air mix ratio. Visually check each operating
condition, by listening for noise, touching
air outlets with a hand, etc.

8. CHECK AIR DUCTS
Check for disconnected or leaking air ducts.
9. CHECK HEATER HOSE TEMPERATURES
- Start engine and warm it up to normal operating temperature.
- Touch both the inlet and outlet heater hoses. The inlet hose
should be hot and the outlet hose should be
warm.
10. CHECK ENGINE COOLANT SYSTEM
Check thermostat operation.
11. CHECK HEATER HOSES
Check heater hoses for proper installation.
12. CHECK HEATER HOSE TEMPERATURES
- Start engine and warm up to normal operating temperature.
- Touch both the inlet and outlet heater hoses. The inlet hose
should be hot and the outlet hose should be
warm.
Component Function Check
Symptom
Insufficient cooling
No cool air comes out. (Airflow volume is normal.)
INSPECTION FLOW
1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE DECRE ...
Component Function Check
Symptom
Noise
Noise is heard when the A/C system operates.
INSPECTION FLOW
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Other materials:
Daytime running light system
Wiring Diagram
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Precautions in repairing high strength steel
High Strength Steel (HSS)
High strength steel is used for body panels in order to reduce vehicle
weight.
Accordingly, precautions in repairing automotive bodies made of high strength
steel are described below:
Read the following precautions when repairing HSS:
Additional points to c ...
Warning function
System Description
OPERATION DESCRIPTION
The warning functions are as follows and are given to the user as warning
information and warnings using
combinations of Intelligent Key warning buzzer, KEY warning lamp, key slot
illumination and combination
meter display in combination meter.
...