Engine Cooling Systems: Other Nissan Quest I

COOLING SYSTEM BLEEDING

Note. On the 1.6L use 2 air relief plugs. On the 2.0L, use an air bleeder cap on heater hose pipe in addition to air relief plug(s). Connect one end of heat resistant hose to heater hose pipe and place other end in coolant reservoir.

1. Before filling cooling system, ensure heater valve is open to allow coolant flow through heater core. See OPENING HEATER VALVE table. Loosen engine and radiator air relief plugs. Remove heater pipe air relief cap. (Scheme 6), (Scheme 7) and (Scheme 8).
2. Connect one end of 40" clear, heat resistant hose to heater pipe relief. Fill coolant reservoir to MAX mark and place hose from heater pipe air relief into reservoir. Ensure hose is below coolant level at all times.
3. Add coolant through radiator filler neck, allowing several minutes for air to escape. When coolant starts to drip from radiator air relief plug, close plug. Tighten plug to 15-19 ft. lbs. (20-26 N.m).
4. Continue adding coolant while gently moving upper radiator hose up and down until coolant no longer lowers in filler neck. Place wire under radiator filler cap negative pressure relief valve. (Scheme 5) DO NOT install cap at this time.
5. Start engine and run at 2000 RPM for 10-15 minutes or until lower radiator hose becomes hot. If coolant comes out of engine air relief plug, close plug. Tighten plug to 15-19 ft. lbs. (20-26 N.m). If coolant in radiator neck lowers, add coolant. If coolant overflows filler neck, install radiator cap (with wire installed).
6. Close engine air relief plug if not already done. Stop engine and allow to cool down completely. Refill radiator and resivoir as necessary. Ensure radiator cap (with wire) is installed. Start engine and warm to operating temperature. If engine temperature raises above normal, stop engine and repeat this step. NOTE: Ensure coolant level in reservoir tank is maintained at MAX mark for the following steps.
7. On vehicles without rear heater, ensure temperature control lever is in full HOT position. Select any fan speed and mode except OFF. Run engine at 3000 RPM for 5 minutes or until outlet air is hot. Repeat this step at least 3 times. Ensure no water noise is present in heater core.
8. On vehicles with rear heater, run engine at 3000 RPM with front temperature control lever in full COLD position. Move rear temperature control lever to full HOT position. Select any fan speed except OFF. Run engine 5 minutes or until rear outlet air is hot.
9. Move rear temperature control lever to full COLD position. Move front temperature control lever is in full HOT position. Select any fan speed and mode except OFF. Run engine 5 minutes or until front outlet air is hot. Repeat steps 8) and 9) at least 3 times. Ensure no water noise is present in front or rear heater core.
10. On all models, stop engine. Fill coolant reservoir to MAX mark. Let engine cool down. Remove radiator cap and remove wire from negative pressure valve. Fill radiator as necessary and reinstall radiator cap. Remove hose from heater pipe relief and quickly install cap on pipe. Fill reservoir as necessary and install reservoir cap.

OPENING HEATER VALVE

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Radiator Fan Motor

Disconnect fan motor harness connector(s). Apply battery voltage and ground across fan motor terminals and observe motor operation. (Scheme 9) See RADIATOR FAN MOTOR OPERATION table. If motor does not operate as indicated, replace motor.

RADIATOR FAN MOTOR OPERATION

Scheme 9

Relays

1. Identify relay type by color. (Scheme 10)Check continuity between relay terminals No. 3 and 5. On Brown relay, also check continuity between terminals No. 6 and 7. If continuity is present, replace relay. If continuity is not present, go to next step.
2. Apply battery voltage across terminals No. 1 and 2. Check continuity between terminals No. 3 and 5. On Brown relay, also check continuity between terminals No. 6 and 7. If continuity is not present, replace relay. If continuity is present, relay is okay.

Scheme 10