Engine Cooling System: Maintenance Nissan 370Z I

Draining

Scheme 21

Scheme 22

1. Connect drain hose. NOTE: Use a general-purpose hose with the dimensions shown in the figure.
2. Open radiator drain plug (2) at the bottom of radiator, and then remove radiator cap. When draining all of engine coolant in the system, open water drain plugs on cylinder block. Refer to " «SETTING»(ref-402630-S22383809082011053100000) ".
3. Remove reservoir tank if 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 " «FLUSHING»(ref-402632-S04244683012011053100000) ".
5. Disconnect drain hose.

Refilling

Scheme 23

Scheme 24

Scheme 25

1. Install radiator drain plug. CAUTION: Be sure to clean drain plug and install with new O-ring. Tightening torque : Refer to " «EXPLODED VIEW»(ref-402632-S19383167382011053100000) ". If water drain plugs on cylinder block are removed, close and tighten them. Refer to " «DISASSEMBLY AND ASSEMBLY»(ref-402630-S33756909112011053100000) ".
2. Remove air cleaner case (LH). Refer to " «EXPLODED VIEW»(ref-402630-S30945629272011053100000) ".
3. Install reservoir tank if removed.
4. Check that each hose clamp has been firmly tightened.
5. Remove air relief plug (2) on radiator left side.
6. Fill radiator, and reservoir tank if removed, to specified level. Pour engine coolant through engine coolant filler neck slowly of less than 2 l (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 " «FOR NORTH AMERICA : FLUIDS AND LUBRICANTS»(ref-402670-S37672262932011053100000) " (FOR NORTH AMERICA) or " «FOR MEXICO : FLUIDS AND LUBRICANTS»(ref-402670-S36022170262011053100000) " (EXCEPT FOR NORTH AMERICA). Engine coolant capacity (With reservoir tank at "MAX" level): Refer to " «PERIODICAL MAINTENANCE SPECIFICATION»(ref-402632-S15846159082011053100000) ". Reservoir tank engine coolant capacity (At "MAX" level): Refer to " «PERIODICAL MAINTENANCE SPECIFICATION»(ref-402632-S15846159082011053100000) ".
7. When engine coolant overflows air relief hole on radiator, install air relief plug with new O-ring. Tightening torque : Refer to " «EXPLODED VIEW»(ref-402632-S19383167382011053100000) ".
8. Repeat step 6 .
9. Install air cleaner case (LH). Refer to " «EXPLODED VIEW»(ref-402630-S30945629272011053100000) ".
10. Install radiator cap.
11. Warm up engine until opening thermostat. Standard for warming-up time is approximately 10 minutes at 3,000 RPM. Check 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.
12. Stop the 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.
13. Refill reservoir tank to "MAX" level line with engine coolant.
14. Repeat steps 11 through 13 two or more times with radiator cap installed until engine coolant level no longer drops.
15. Check cooling system for leakage with engine running.
16. Warm up the 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.
17. Repeat step 16 three times.
18. If sound is heard, bleed air from cooling system by repeating step 6 , and steps from 10 to 17 until engine coolant level no longer drops.
19. Check that the reservoir tank cap is tightened.

Scheme 26

1. Install radiator drain plug. CAUTION: Be sure to clean drain plug and install with new O-ring. Tightening torque : Refer to " «EXPLODED VIEW»(ref-402632-S19383167382011053100000) ". If water drain plugs on cylinder block are removed, close and tighten them. Refer to " «DISASSEMBLY AND ASSEMBLY»(ref-402630-S33756909112011053100000) ".
2. Remove air cleaner case (LH). Refer to " «EXPLODED VIEW»(ref-402630-S30945629272011053100000) ".
3. Install reservoir tank if removed.
4. Remove air relief plug (2) on radiator.
5. Fill radiator with water until water spills from the air relief hole, then close air relief plug. Tightening torque : Refer to " «EXPLODED VIEW»(ref-402632-S19383167382011053100000) ".
6. Fill radiator and reservoir tank with water and reinstall radiator cap.
7. Install air cleaner case (LH). Refer to " «EXPLODED VIEW»(ref-402630-S30945629272011053100000) ".
8. Run the engine and warm it up to normal operating temperature.
9. Rev the engine two or three times under no-load.
10. Stop the engine and wait until it cools down.
11. Drain water from the system. Refer to " «DRAINING»(ref-402632-S39255201782011053100000) ".
12. Repeat steps 1 through 11 until clear water begins to drain from radiator.
13. Check that the reservoir tank cap is tightened.

Scheme 27

Scheme 28

Scheme 29

1. Check valve seat (A) 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.
2. Pull negative-pressure valve to open it, and check that it close completely when released. Check that there is no dirt or damage on the valve seat of radiator cap negative-pressure valve. Check that there are no unusualness in the opening and closing conditions of negative-pressure valve.
3. Check radiator cap relief pressure. Standard and limit : Refer to " «RADIATOR»(ref-402632-S13811369172011053100000) ". When connecting radiator cap to the radiator cap tester and the radiator cap tester adapter (commercial service tool) (A), apply engine coolant to the cap seal surface.
4. Replace radiator cap if there is an unusualness related to the above three. CAUTION: When installing radiator cap, thoroughly wipe out the water outlet (front) filler neck to remove any waxy residue or foreign material.