Engine Cooling System: Maintenance Nissan Quest IV

Draining

Scheme 22

1. Remove engine under cover.
2. Open radiator drain plug (1) 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 " «ENGINE STAND SETTING»(ref-672620-S08475330862014112400000) ".
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-672622-S28511669142014112400000) ".

Refilling

Scheme 23

Scheme 24

Scheme 25

1. Install reservoir tank if removed and radiator drain plug. CAUTION: Be sure to clean drain plug and install with new O-ring. Tightening torque: Refer to " «EXPLODED VIEW»(ref-672622-S30559909872014112400000) ". If water drain plugs on cylinder block are removed, close and tighten them. Refer to " «DISASSEMBLY AND ASSEMBLY»(ref-672620-S28667100012014112400000) ".
2. Check that each hose clamp has been firmly tightened.
3. Remove air duct assembly and air cleaner cases (upper and lower) assembly. Refer to " «EXPLODED VIEW»(ref-672620-S30704453622014112400000) ".
4. Remove air bleeder plug (1) of heater pipe.
5. Fill radiator, and reservoir tank if removed, to specified level. CAUTION: Never spill engine coolant to electronic equipments. (alternator etc.) 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. When coolant comes out from the air bleeder plug of heater pipe, tighten the bleeder plug. Engine coolant capacity (With reservoir tank at "MAX" level): Refer to " «PERIODICAL MAINTENANCE SPECIFICATION»(ref-672622-S36907389412014112400000) ". Reservoir tank engine coolant capacity (At "MAX" level): Refer to " «PERIODICAL MAINTENANCE SPECIFICATION»(ref-672622-S36907389412014112400000) ".
6. Install air duct assembly and air cleaner cases (upper and lower) assembly. Refer to " «EXPLODED VIEW»(ref-672620-S30704453622014112400000) ".
7. Install radiator cap.
8. Start the engine.
9. Maintain the engine at 1, 800 RPM for approximately 10 seconds. After performing this, stop the engine.
10. Remove radiator cap with the engine cold (approx. 50°C or less), and check the cooling water level. If the fluid level is low, refill with cooling water to the lip of radiator.
11. Repeat Steps from 7 to 9 four times.
12. Cap the radiator, and start the engine.
13. 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.
14. 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. CAUTION: Never spill engine coolant to electronic equipments. (alternator etc.)
15. Refill reservoir tank to "MAX" level line with engine coolant.
16. Repeat steps 7 through 10 two or more times with radiator cap installed until engine coolant level no longer drops.
17. Check cooling system for leakage with engine running.
18. 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.
19. Repeat step 13 three times.
20. If sound is heard, bleed air from cooling system by repeating step 5 , and steps from 7 to 14 until engine coolant level no longer drops.

Flushing

1. Install reservoir tank if removed and radiator drain plug. CAUTION: Be sure to clean drain plug and install with new O-ring. Tightening torque: Refer to " «EXPLODED VIEW»(ref-672622-S30559909872014112400000) ". If water drain plugs on cylinder block are removed, close and tighten them. Refer to " «DISASSEMBLY AND ASSEMBLY»(ref-672620-S28667100012014112400000) ".
2. Remove air duct assembly and air cleaner cases (upper and lower) assembly. Refer to " «EXPLODED VIEW»(ref-672620-S30704453622014112400000) ".
3. Remove air bleeder plug.
4. Fill with cooling water until it overflows from the bleeder plug.
5. Install air bleeder plug.
6. Fill radiator and reservoir tank with water and reinstall radiator cap. CAUTION: Never spill water to electronic equipments. (alternator etc.) When water overflows disconnected heater hose, connect heater hose, and continue filling the water.
7. Install air duct assembly and air cleaner cases (upper and lower) assembly. Refer to " «EXPLODED VIEW»(ref-672620-S30704453622014112400000) ".
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-672622-S03082931862014112400000) ".
12. Repeat steps 1 through 11 until clear water begins to drain from radiator.

Scheme 26

Scheme 27

1. Check valve seat (A) of radiator cap. Check if valve seat is swollen to the extent that the edge of the plunger (B) cannot be seen when watching it vertically from the top. Check if valve seat has no soil and damage. 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.
2. Check radiator cap relief pressure. Standard and limit: Refer to " «RADIATOR»(ref-672622-S33308841112014112400000) ". When connecting radiator cap to the radiator cap tester (commercial service tool) and the radiator cap tester adapter (commercial service tool) (A), apply engine coolant to the cap seal surface.
3. Replace radiator cap if there is an unusualness related to the above three.