
ENGINE
CO
A
CO
SECTION
ENGINE COOLING SYSTEM C
D
E
CONTENTS
VQ40DE ON-VEHICLE REPAIR ................................ 15
. F
PRECAUTION .............................................. 2
. RADIATOR ........................................................ 15
Exploded View ........................................................15
. G
PRECAUTIONS .................................................. 2
. Removal and Installation ........................................15
.
Precaution for Supplemental Restraint System Checking Radiator ..................................................17
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .................................................................. 2
. ENGINE COOLING FAN ................................... 18 H
Precaution for Liquid Gasket .................................... 2 . Exploded View ........................................................18
.
Removal and Installation (Crankshaft driven type) 18 ....
PREPARATION ........................................... 4
. Removal and Installation (Motor driven type) .........19 . I
PREPARATION .................................................. 4
. WATER PUMP .................................................. 21
Special Service Tool ................................................ 4
. Exploded View ........................................................21
.
Commercial Service Tool ......................................... 4
. Removal and Installation ........................................21
. J
FUNCTION DIAGNOSIS .............................. 6
. WATER INLET AND THERMOSTAT ASSEM-
BLY .................................................................... 26 K
COOLING SYSTEM ........................................... 6
. Exploded View ........................................................26
.
Cooling Circuit .......................................................... 6
. Removal and Installation ........................................26
.
Schematic ................................................................ 7
.
WATER OUTLET AND WATER PIPING .......... 28 L
OVERHEATING CAUSE ANALYSIS ................. 8
. Exploded View ........................................................28
.
Troubleshooting Chart .............................................. 8
. Removal and Installation ........................................28
.
ON-VEHICLE MAINTENANCE ................... 10
. M
SERVICE DATA AND SPECIFICATIONS
ENGINE COOLANT ..........................................10
. (SDS) ........................................................... 30
.
System Inspection .................................................. 10
. N
SERVICE DATA AND SPECIFICATIONS
Changing Engine Coolant ...................................... 11
.
(SDS) ................................................................. 30
Standard and Limit .................................................30
.
O
P
Revision: October 2008 CO-1 2009 Xterra
PRECAUTIONS
< PRECAUTION > [VQ40DE]
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER" INFOID:0000000004063633
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING: