NISSAN 350Z 2007 Z33 Engine Cooling System User Guide

ENGINE COOLANT
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3. Remove reservoir tank as necessary, and drain engine coolant and clean reservoir tank before installing.
4. Check drained engine coolant for contaminants such as rust, corrosion or discoloration.
If contaminated, flush the engine cooling system. Refer to CO-12, "
FLUSHING COOLING SYSTEM" .
REFILLING ENGINE COOLANT
1. Install reservoir tank if removed, and radiator drain plug.
CAUTION:
Be sure to clean drain plug and install with new O-ring.
If water drain plugs on cylinder block are removed, close and tighten them. Refer to EM-111,
"ASSEMBLY" .
2. Make sure that each hose clamp has been firmly tightened.
3. Remove air relief plug (1) on heater hose.
4. Fill radiator and reservoir tank to specified level.

Pour engine coolant through engine coolant filler neck
slowly of less than 2 (2-1/8 US qt, 1-3/4 lmp qt) a minute
to allow air in system to escape.

Use Genuine NISSAN Long Life Antifreeze/Coolant or
equivalent mixed with water (distilled or demineralized).
Refer to MA-11, "
RECOMMENDED FLUIDS AND LUBRI-
CANTS".

When engine coolant overflows air relief hole on heater hose,
install air relief plug with new O-ring.
5. Install radiator cap.
6. Warm up until opening thermostat. Standard for warming-up time is approximately 10 minutes at 3,000
rpm.

Make sure thermostat opening condition by touching radiator hose (lower) to see a flow of warm water.
CAUTION:
Watch water temperature gauge so as not to overheat engine.Radiator drain plug:
: 1.2 N·m (0.12 kg-m, 11 in-lb)
2 : Heater hose
: Vehicle front
PBIC5029E
Engine coolant capacity
(with reservoir tank at “MAX” level)
: Approx. 9.0 (9 - 1/2 US qt, 7- 7/8 lmp qt)
PBIC5073E
Reservoir tank capacity (at “MAX” level)
: 0.8 (7/8 US qt, 3/4 lmp qt)
Air relief plug:
: 1.2 N·m (0.12 kg-m, 11 in-lb)
SMA412B

CO-12
ENGINE COOLANT
Revision: 2006 November2007 350Z
7. Stop engine and cool down to less than approximately 50°C (122°F).

Cool down using fan to reduce the time.

If necessary, refill radiator up to filler neck with engine coolant.
8. Refill reservoir tank to “MAX” level line with engine coolant.
9. Repeat steps 4 through 7 two or more times with radiator cap installed until engine coolant level no longer
drops.
10. Check cooling system for leaks with engine running.
11. Warm up engine, and check for sound of engine coolant flow while running engine from idle up to 3,000
rpm with heater temperature controller set at several position between “COOL” and “WARM”.

Sound may be noticeable at heater unit.
12. Repeat step 11 three times.
13. If sound is heard, bleed air from cooling system by repeating step 4 through 7 until engine coolant level no
longer drops.
FLUSHING COOLING SYSTEM
1. Install reservoir tank if removed, and radiator drain plug.
CAUTION:
Be sure to clean drain plug and install with new O-ring.
If water drain plugs on cylinder block are removed, close and tighten them. Refer to EM-111,
"ASSEMBLY" .
2. Remove air relief plug (1) on heater hose.
3. Fill radiator with water until water spills from the air relief hole, then close air relief plug. Fill radiator and
reservoir tank with water and reinstall radiator cap.
4. Run engine and warm it up to normal operating temperature.
5. Rev engine two or three times under no-load.
6. Stop engine and wait until it cools down.
7. Drain water from the system. Refer to CO-10, "
DRAINING ENGINE COOLANT" .
8. Repeat steps 1 through 7 until clear water begins to drain from radiator.Radiator drain plug:
: 1.2 N·m (0.12 kg-m, 11 in-lb)
2 : Heater hose
: Vehicle front
PBIC5029E
Air relief plug:
: 1.2 N·m (0.12 kg-m, 11 in-lb)

RADIATOR
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RADIATORPFP:21400
Removal and InstallationNBS0001W

Refer to GI-11, "Components" for symbol marks in the figure.
WARNING:
Do not remove radiator cap when engine is hot. Serious burns could occur from high-pressure engine
coolant escaping from radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter of a turn to
release built-up pressure. Carefully remove radiator cap by turning it all the way.
REMOVAL
1. Remove undercover with power tool.
2. Drain engine coolant from radiator. Refer to CO-10, "
Changing Engine Coolant" .
CAUTION:

Perform this step when engine is cold.

Do not spill engine coolant on drive belts.
3. Remove air duct and air cleaner case assembly. Refer toEM-15, "
AIR CLEANER AND AIR DUCT" .
4. Remove bracket mounting bolt for anchoring A/C piping from vehicle left side, so that A/C piping can be
moved.
1. Reservoir tank hose 2. Reservoir tank cap 3. Reservoir tank hose
4. Radiator hose (upper) 5. Upper mount bracket 6. Mounting rubber (upper)
7. Cover 8. Radiator 9. Mounting rubber (lower)
10. Radiator drain plug 11. O-ring 12. A/T fluid cooler hose (A/T models)
13. Radiator hose (lower) 14. Radiator cooling fan assembly 15. Reservoir tank
A. To water outlet B. To A/T fluid cooler tube (A/T models) C. To water inlet
D. To water outlet
PBIC5031E

CO-14
RADIATOR
Revision: 2006 November2007 350Z
5. Remove reservoir tank.
6. Removal radiator hoses (upper and lower) and reservoir tank hose.
CAUTION:
Be careful not to allow engine coolant to contact drive belts.
7. Remove radiator cooling fan assembly. Refer to CO-21, "
COOLING FAN" .
8. Disconnect A/T fluid cooler hoses. (A/T models)

Install blind plug to avoid leakage of A/T fluid.
9. Remove cover, and then two A/C condenser mounting bolts
located in upper part of radiator.
10. Rotate two radiator upper mount brackets 90 degrees in the
direction as shown in the figure, and remove them.
11. Remove radiator as follows:
CAUTION:
Do not damage or scratch A/C condenser and radiator core when removing.
a. With lifting and pulling radiator in a rear direction, disassemble
lower mount from radiator core support center.
CAUTION:
Because A/C condenser is onto the front-lower portion of
radiator, moving to rear direction should be at minimum.
b. Lift A/C condenser up and remove radiator after disengaging the
fitting as front-bottom surface.
CAUTION:
Lifting A/C condenser should be minimum to prevent a load
to A/C piping.
c. After removing radiator, put A/C condenser on radiator core sup-
port center to prevent a load to A/C piping, and temporarily fix it
with rope or similar means.
PBIC1053E
PBIC1052E
PBIC1936E
PBIC1054E

RADIATOR
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INSTALLATION
Installation is the reverse order of removal.
INSPECTION AFTER INSTALLATION

Check for leaks of engine coolant using radiator cap tester adapter (commercial service tool) and radiator
cap tester (commercial service tool). Refer to CO-10, "
LEAK CHECK" .

Start and warm up engine. Visually make sure that there is no leaks of engine coolant and A/T fluid.
Checking Radiator Cap NBS0001X

Check valve seat of radiator cap.
–Check if valve seat is swollen to the extent that the edge of the
plunger cannot be seen when watching it vertically from the top.
–Check if valve seat has no soil and damage.

Pull negative-pressure valve to open it, and make sure that it is
completely closed when released.
–Make sure that there is no dirt or damage on the valve seat of
radiator cap negative-pressure valve.
–Make sure that there are no unusualness in the opening and
closing conditions of negative-pressure valve.

Check radiator cap relief pressure.
–When connecting radiator cap to the radiator cap tester (com-
mercial service tool) (A) and the radiator cap tester adapter
(commercial service tool) (B), apply engine coolant to the cap
seal surface.

Replace radiator cap if there is an unusualness related to the above three.
CAUTION:
When installing radiator cap, thoroughly wipe out the filler neck to remove any waxy residue or foreign
material.
Checking Radiator NBS0001Y
Check radiator for mud or clogging. If necessary, clean radiator as follows.

Be careful not to bend or damage the radiator fins.

When radiator is cleaned without removal, remove all surrounding parts such as cooling fan, radiator
shroud and horns. Then tape harness and electrical connectors to prevent water from entering.
1. Apply water by hose to the back side of radiator core vertically downward.
PBIC2816E
SMA967B
Standard:
108 - 127 kPa (1.1 - 1.3 kg/cm
2 , 16 - 18 psi)
Limit:
88 kPa (0.9 kg/cm
2 , 13 psi)
PBIC5122J

CO-16
RADIATOR
Revision: 2006 November2007 350Z
2. Apply water again to all radiator core surface once per minute.
3. Stop washing if any stains no longer flow out from radiator.
4. Blow air into the back side of radiator core vertically downward.

Use compressed air lower than 490 kPa (5 kg/cm2 , 71 psi) and keep distance more than 30 cm (11.8
in).
5. Blow air again into all the radiator core surfaces once per minute until no water sprays out.

RADIATOR (ALUMINUM TYPE)
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RADIATOR (ALUMINUM TYPE)PFP:21460
Disassembly and AssemblyNBS0001Z

Refer to GI-11, "Components" for symbol marks in the figure.
PREPARATION
1. Attach spacer to tip of radiator plate pliers A (SST).
Spacer specification: 18 mm (0.71 in) wide × 8.5 mm (0.335 in)
long × 1.5 mm (0.059 in) thick.
2. Make sure that when radiator plate pliers A [SST: KV99103510 ( — )] are closed dimension H′′ is
approx. 7.6 mm (0.299 in).
3. Adjust dimension H′′ with spacer, if necessary.
DISASSEMBLY
1. Remove upper and lower tanks with radiator plate pliers B
(SST).
CAUTION:
Do not disassemble lower tank and A/T fluid cooler. (A/T
models)
NOTE:
Regard lower tank and A/T fluid cooler as an assembly. (A/T
models)
1. Upper tank 2. Sealing rubber 3. Core
4. Lower tank 5. Lower tank (with A/T fluid cooler)
A. A/T models
PBIC5033E
SLC655CB
SLC903-A

CO-18
RADIATOR (ALUMINUM TYPE)
Revision: 2006 November2007 350Z

Grip the crimped edge and bend it upwards so that radiator
plate pliers B [SST: KV99103520( — )] slips off.
CAUTION:
Do not bend excessively.

In areas where radiator plate pliers B [SST: KV99103520( —
)] cannot be used, use screwdriver to bend the edge up.
CAUTION:
Be careful not to damage tank.
2. Remove sealing rubber.
3. Make sure the edge stands straight up.
ASSEMBLY
1. Clean contact portion of tank.
SLC893
SLC930
SLC931
SLC932

RADIATOR (ALUMINUM TYPE)
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2. Install sealing rubber while pushing it with fingers.
CAUTION:
Be careful not to twist sealing rubber.
3. Caulk tank in numerical order as shown in the figure with radia-
tor plate pliers A (SST).

Use pliers in the locations where radiator plate pliers A [SST:
KV99103510 ( — )] cannot be used.
SLC917A
SLC904-A
PBIC2076E
SLC897

CO-20
RADIATOR (ALUMINUM TYPE)
Revision: 2006 November2007 350Z
4. Make sure that the rim is completely crimped down.
5. Make sure that there is no leakage.
Refer to CO-20, "
INSPECTION" .
INSPECTION
1. Apply pressure with radiator cap tester adapter (commercial ser-
vice tool) and radiator cap tester (commercial service tool).

Provide used radiator and connect it to tested radiator using
radiator hoses as shown in the figure.
NOTE:
The used radiator should be tested beforehand to confirm it
has no leakage. If used one is not available, it is possible to
use new service part as a radiator testing tool.
WARNING:
To prevent the risk of hose coming undone while under pressure, securely fasten it down with
hose clamp.
CAUTION:
Attach hose to A/T fluid cooler to seal its inlet and outlet.
(A/T models)
2. Check for leakage by soaking radiator in water container with
the testing pressure applied.Standard height “H” : 8.0 - 8.4 mm (0.315 - 0.331 in)
SLC554A
Testing pressure
: 157 kPa (1.6 kg/cm
2 , 23 psi)PBIC5158E
PBIC1699E