heating NISSAN VERSA 2006 Workshop Service Owner's Manual

TROUBLE DIAGNOSIS
MTC-33
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MTC
Revision: June 20062007 Versa
Operational CheckEJS0057J
The purpose of the operational check is to confirm that the system operates properly.
CHECKING BLOWER
1. Turn blower control dial clockwise to "1" position. Blower should operate on low speed.
2. Turn blower control dial clockwise to "2" position, and continue checking blower speed until all speeds are
checked.
3. Leave blower on Maximum speed.
If NG, go to trouble diagnosis procedure for MTC-37, "
Blower Motor Circuit" .
If OK, continue the check.
CHECKING DISCHARGE AIR
1. Turn mode door control dial to each position.
2. Confirm that discharge air comes out according to the air distribution table. Refer to MTC-22, "
Discharge
Air Flow" .
If NG, go to trouble diagnosis procedure for MTC-34, "
Mode Door" .
If OK, continue the check.
CHECKING RECIRCULATION
1. Set intake door lever to REC position.
2. Operate intake door lever to FRE position.
3. Listen for intake door position change (you should hear blower sound change slightly).
If NG, go to trouble diagnosis procedure for MTC-36, "
Intake Door" .
If OK, continue the check.
CHECKING TEMPERATURE DECREASE
1. Turn temperature control dial counterclockwise to full cold position.
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for MTC-50, "
Insufficient Cooling" .
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1. Turn temperature control dial clockwise to full hot position.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for MTC-58, "
Insufficient Heating" .
If OK, continue the check.
CHECKING A/C SWITCH (IF EQUIPPED)
1. Turn fan control dial to the desired (1 to 4 speed) position.
2. Press A/C switch.
3. A/C switch indicator will turn ON.

Confirm that the compressor clutch engages (sound or visual inspection).
If NG, go to trouble diagnosis procedure for MTC-41, "
Magnet Clutch Circuit (If Equipped)" .
If OK, continue the check.
CHECKING DEFROST A/C SWITCH (IF EQUIPPED)
1. Turn fan control dial to the desired (1 to 4 speed) position.
2. Turn mode dial to ( ) DEF.
3. Confirm that the compressor clutch engages (sound or visual inspection).
If NG, go to trouble diagnosis procedure for MTC-41, "
Magnet Clutch Circuit (If Equipped)" .
If all operational checks are OK (symptom cannot be duplicated), go to MTC-24, "
How to Perform Trouble
Diagnosis for Quick and Accurate Repair" and perform tests as outlined. If symptom appears, refer to MTC-
24, "SYMPTOM TABLE" and perform applicable trouble diagnosis procedures. Conditions : Engine running at normal operating temperature

MTC-58
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
Insufficient HeatingEJS0057Q
SYMPTOM: Insufficient heating
INSPECTION FLOW
1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE
1. Turn temperature control dial clockwise to maximum heat position.
2. Check for hot air at discharge air outlets.
Can the symptom be duplicated?
YES >> GO TO 3.
NO >> GO TO 2.
2. CHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to MTC-33, "
Operational Check" .
Does another symptom exist?
YES >> Refer to MTC-24, "SYMPTOM TABLE" .
NO >> System OK.
3. CHECK FOR SERVICE BULLETINS
Check for any service bulletins.
>> GO TO 4.
4. CHECK COOLANT SYSTEM
1. Check engine coolant level. Refer to CO-8, "
ENGINE COOLANT" .
2. Check hoses for leaks or kinks.
3. Check Radiator cap. Refer to CO-13, "
Checking Radiator Cap" .
OK or NG
OK >> GO TO 5.
NG >> Repair/replace as necessary.
5. CHECK AIR MIX DOOR CABLE
Check air mix door cable operation. Refer to MTC-70, "
Air Mix Door Cable Adjustment" .
OK or NG
YES >> GO TO 6.
NO >> Adjust or replace air mix door cable. Refer to MTC-70, "
Air Mix Door Cable Adjustment" .
6. CHECK AIR DUCTS
Check ducts for air leaks.
OK or NG
OK >> GO TO 7.
NG >> Repair air leaks.
7. CHECK HEATER HOSE TEMPERATURES
1. Start engine and warm it up to normal operating temperature.
2. Touch both the inlet and outlet heater hoses.
Is the inlet hose hot and the outlet hose warm? YES or NO
YES >> GO TO 8.
NO >> Both hoses warm: GO TO 9.