Engine Cooling System: Other Nissan 350Z I

Precautions for Battery Service

Before disconnecting the battery, lower both the driver and passenger windows. This will prevent any interference between the window edge and the vehicle when the door is opened/closed. During normal operation, the window slightly raises and lowers automatically to prevent any window to vehicle interference. The automatic window function will not work with the battery disconnected.

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER"

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 SRS and SB section of this article.

Special Service Tools

The actual shapes of Kent-Moore tools may from those of special service tools illustrated here.

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LEVEL CHECK

1. Check if the reservoir tank engine coolant level is within the MIN to MAX range when the engine is cool.
2. Adjust the coolant level as necessary.

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LEAK CHECK

1. To check for leaks, apply pressure to the cooling system with the tester. Testing pressure: 157 kPa (1.6 kg/cm 2 , 23 psi)

Note. In a case that engine coolant decreases, replenish radiator with engine coolant.

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Changing Engine Coolant

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1. Remove engine undercover using power tools.
2. Open radiator drain plug at the bottom of radiator, and remove radiator cap. When draining all the engine coolant in the system, also perform the following steps.
3. Remove the reservoir tank, drain the engine coolant and clean the tank before installing.
4. Drain engine coolant from both sides of cylinder block at B and C in the figure and cylinder block front at A in the figure when draining all the engine coolant in the system.
5. Check drained engine coolant for contaminants such as rust, corrosion or discoloration.

If contaminated, flush the engine cooling system. Refer to " FLUSHING COOLING SYSTEM ".

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1. Install reservoir tank if removed, and radiator drain plug.
2. Close and tighten cylinder block drain plugs securely if removed. Apply sealant to the threads of the cylinder block drain plugs. Use Genuine Thread Sealant or equivalent. Radiator drain plug: : 0.78 - 1.6 N.m (0.08 - 0.15 kg-m, 7-13 in-lb) Cylinder block drain plug (LH): : 17.6 - 21.6 N.m (1.8 - 2.2 kg-m, 13-15 ft-lb) Cylinder block drain plug (RH): : 17.6 - 21.6 N.m (1.8 - 2.2 kg-m, 13-15 ft-lb) Cylinder block drain plug (Front side): : 7.8 - 11.8 N.m (0.8 -1.2 Kg-m, 69 - 104 in-lb)
3. Remove air relief plug on heater hose.
4. Fill radiator and reservoir tank to specified level. Pour engine coolant through coolant filler neck slowly of less than 2l (2-1/8US qt, 1-3/4 lmp qt) a minute to allow air in system to escape. Use genuine Nissan Anti-freeze Coolant or equivalent mixed with water (distilled or demineralized). Engine coolant capacity (with reservoir tank at MAX level) : Approximately 8.7 l (9-1/4 US qt, 7-5/8 lmp qt) Reservoir tank capacity (at MAX level) :0.8 l (7/8 US qt, 3/4 lmp qt) When engine coolant overflows air relief hole on heater hose, install air relief plug with new O-ring. Air relief plug: : 0.78 - 1.6 N.m (0.08 - 0.15 kg-m, 7-13 ft-lb)
5. Warm up engine to normal operating temperature with radiator cap installed.
6. Run engine at 3,000 RPM for 10 seconds and return to idle speed. Repeat two or three times.
7. Stop engine and cool down to less than approximately 50° C (122° F). Cool down using a 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.

1. Clean excess engine coolant from engine.

Checking Radiator

Check radiator for mud or clogging. If necessary, clean radiator as follows.

1. Be careful not to bend or damage the radiator fins.
2. When radiator is cleaned without removal, remove all surrounding parts such as cooling fan, radiator shroud and horns. Then tape the harness and electrical connectors to prevent water from entering.

1. Apply water by hose to the back side of the radiator core vertically downward.
2. Apply water again to all radiator core surface once per minute.
3. Stop washing if any stains no longer flow out from the radiator.
4. Blow air into the back side of radiator core vertically downward. Use compressed air lower than 490 kPa (5 kg/cm 2 , 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.

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PREPARATION

1. Attach the spacer to the tip of the radiator plate pliers A (special service tool). Spacer specification: 1.5 mm (0.059 in) thick x 18 mm (0.71 in) wide x 8.5 mm (0.335 in) long.
2. Make sure that when radiator plate pliers A (special service tool) are closed dimension H" is approx. 7.6 mm (0.299 in).
3. Adjust dimension H" with the spacer, if necessary.

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1. Remove upper and lower tanks with radiator plate pliers B (special service tool). Grip the crimped edge and bend it upwards so that radiator plate pliers B (special service tool) slips off. Do not bend excessively. In areas where radiator plate pliers B (special service tool) cannot be used, use a screwdriver to bend the edge up. Be careful not to damage tank.
2. Remove sealing rubbers.
3. Make sure the edge stands straight up.
4. Remove oil cooler from tank. (A/T model)

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1. Install oil cooler. (A/T model) Pay attention to direction of conical washer.
2. Clean contact portion of tank.
3. Install sealing rubber. Push it in with fingers. Be careful not to twist sealing rubber.
4. Caulk tank in specified sequence with radiator plate pliers A (special service tool). Use pliers in the locations where radiator plate pliers A (special service tool) cannot be used.
5. Make sure that the rim is completely crimped down. Standard height "H": 8.0 - 8.4 mm (0.315 - 0.331 in)
6. Confirm that there is no leakage. Refer to " «INSPECTION»(ref-212004-S18414112862005122300000) ".

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1. Apply pressure with radiator cap tester adapter (special service tool) and radiator cap tester. Specified pressure value : 157 kPa (16 kg/cm 2 , 23 psi) WARNING: To prevent the risk of the hose coming undone while under pressure, securely fasten it down with a hose clamp. CAUTION: Attach a hose to the oil 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.

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Thermostat

THERMOSTAT

Radiator

RADIATOR

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