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Engine Cooling Specifications & Engine Cooling Fans: Other Nissan Maxima A32

Cooling Fan 14 illustrations ~3254 words

ALTIMA

  1. Set heater control to HOT position. Open air relief plug. (Scheme 17) Fill radiator slowly to allow air to escape. Close air relief plug when coolant starts to flow out of air relief hole. Fill coolant reservoir to MAX mark.
  2. Start and warm engine to normal operating temperature. Increase engine speed to 2500 RPM for 10 seconds, and then return to idle. Repeat 2-3 times. Turn engine off.
  3. Check coolant level. Install radiator cap. Warm engine to normal engine temperature. Move heater control at several positions between HOT and COLD. Increase engine speed to 4000 RPM. Listen for coolant flow at heater valve. If coolant flow is heard, repeat step 2) until coolant level no longer drops. Check air relief and drain plug for leaks.

Scheme 17

Scheme 17
Scheme 17

FRONTIER, PATHFINDER & PICKUP

  1. Before filling cooling system, ensure heater valve is open to allow coolant flow through heater core. When filling cooling system, ensure air relief plug is loose to allow trapped air to exit system. (Scheme 18)or (Scheme 19). Tighten air relief plug after filling cooling system.
  2. Install radiator cap. Warm engine to normal operating temperature. Race engine 2-3 times under no-load. Turn engine off. Add coolant after engine cools down. Check air relief and drain plug for leaks.

Scheme 18

Scheme 18
Scheme 18

Scheme 19

Scheme 19
Scheme 19

MAXIMA

Fill radiator slowly to allow air to escape. Fill coolant reservoir to MAX mark. Install radiator cap and warm engine to normal operating temperature. Race engine 2-3 times under no-load. Turn engine off. Add coolant after engine cools down. Check drain plug for leaks.

QUEST

  1. Loosen engine and radiator air relief plugs. Remove heater pipe air relief cap. (Scheme 20) 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 coolant reservoir. Ensure hose is below coolant level at all times.
  2. Slowly 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).
  3. Continue adding coolant while gently moving upper radiator hose up and down until coolant level no longer drops in filler neck. Place wire under radiator filler cap negative pressure relief valve. (Scheme 22) DO NOT install cap at this time.
  4. 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).
  5. Close engine air relief plug if not already done. Stop engine and allow to cool down completely. Refill radiator and reservoir 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.
  6. 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.
  7. 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.
  8. Move rear temperature control lever to full COLD position. Move front temperature control lever to full HOT position. Select any fan speed and mode except OFF. Run engine 5 minutes or until front outlet air is hot. Repeat steps 7) and 8) at least 3 times. Ensure no water noise is present in front or rear heater core.
  9. On models equipped with automatic A/C, operate engine at 3000 RPM with front climate control set at 60°F and rear A/C control unit temperature switch to full WARM position with fan on for 5 minutes or until rear outlet air is hot. Turn rear control unit to full COOL position and set front climate control to 90°F until front outlet air is hot. Repeat process at least 3 times until no water noise is heard at 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.

Scheme 20

Scheme 20
Scheme 20

SENTRA & 200SX

  1. Set heater control to HOT position. Open air relief plug. (Scheme 21) Fill radiator slowly to allow air to escape. Close air relief plug when coolant starts to flow out of air relief hole. Fill coolant reservoir to MAX mark.
  2. Reinstall radiator cap with pressure relief valve open. (Scheme 22) Start and warm engine to normal operating temperature. Increase engine speed to 2500 RPM for 10 seconds, and then return to idle. Repeat 2-3 times. Turn engine off. Add coolant after engine cools down. Repeat procedure 2 or more times.
  3. Check coolant level. Install proper radiator cap. Warm engine to normal engine temperature. Move heater control at several positions between HOT and COLD. Increase engine speed to 4000 RPM. Listen for coolant flow at heater valve. If coolant flow is heard, repeat step 2) until coolant level no longer drops. Check air relief and drain plug for leaks.

Scheme 21

Scheme 21
Scheme 21

Scheme 22

Scheme 22
Scheme 22

240SX

  1. Turn ignition on. Set temperature control to maximum heat position. Turn ignition off after air mix door moves to HOT position.
  2. Open air relief plug. (Scheme 23) Fill radiator slowly to allow air to escape. Close air relief valve when coolant starts to flow out of air relief hole. Fill coolant reservoir to MAX mark.
  3. Reinstall radiator cap. Start and warm engine to normal operating temperature. Race engine 2-3 times under no-load. Turn engine off. Add coolant after engine cools down.
  4. Check coolant level. Warm engine to normal engine temperature. Move heater control to HOT position. Increase engine speed to 4000 RPM. Listen for coolant flow at heater valve. If coolant flow is heard, repeat step 1) until coolant level no longer drops. Check air relief and drain plug for leaks.

Scheme 23

Scheme 23
Scheme 23

COOLING FAN CIRCUIT (1997 ALTIMA)

  1. Check Low Speed Fan Operation Turn ignition off. Disconnect cooling fan relays No. 2 and 3. Relays are located in underhood relay box. Start engine. Set temperature lever to full cold position. Turn A/C switch and blower fan switch to ON position. Run engine at idle for several minutes. Verify cooling fan operates at low speed. If fan does not operate at low speed, go to step 4). If fan operates at low speed, go to next step.
  2. Check High Speed Fan Operation Turn ignition off. Reconnect cooling fan relays No. 2 and 3. Disconnect cooling fan relay No. 1. Turn ignition on. Turn A/C switch and blower fan switch to OFF position. Disconnect Engine Coolant Temperature (ECT) sensor harness connector. Connect a 150-ohm resistor across ECT sensor harness connector terminals. Restart engine. Verify cooling fan operates at high speed. If fan does not operate at high speed, go to step 6). If fan operates at high speed, check cooling system for leaks, radiator cap pressure and thermostat operation. Repair as necessary. Inspect ECT sensor. Replace as necessary.
  3. Check Ground Circuit (Low Speed) Turn ignition off. Disconnect cooling fan motors No. 1 and 2 harness connectors. (Scheme 24) Using an ohmmeter, check continuity between fan motor harness connector terminal "a" and fan relay No. 1 harness connector, terminal No. 5 (White/Black wire). (Scheme 25)and (Scheme 26). If continuity does not exist, repair open in White/Black wire. If continuity exists, check continuity between fan motor harness connector terminal "e" and fan relay No. 1 harness connector, terminal No. 5 (White/Black wire). If continuity does not exist, repair open White/Black wire. If continuity exists, go to next step.
  4. Check continuity between fan motor harness connector terminal "d" (Black wire) and ground. (Scheme 25) If continuity does not exist, repair open in Black wire. If continuity exists, check continuity between fan motor harness connector terminal "h" (Black wire) and ground. If continuity does not exist, repair open in Black wire. If continuity exists, go to next step.
  5. Check Power Supply (Low Speed) Turn ignition off. Using a voltmeter, check voltage between cooling fan relay No. 1 harness connector, terminal No. 1 (White wire) and ground. (Scheme 27) If battery voltage is not present, repair open in White wire. If battery voltage is present, check voltage between cooling fan relay No. 1 harness connector, terminal No. 3 (White/Blue wire) and ground. If battery voltage is not present, repair open in White/Blue wire, check for blown fuse No. 33 (10-Amp) or open 30-Amp fusible link. If battery voltage is present, go to next step.
  6. Check Output Signal Circuit (Low Speed) Disconnect ECM harness connector. Using an ohmmeter, check continuity between ECM harness connector terminal No. 14 and cooling fan relay No. 1 harness connector, terminal No. 2 (Light Green/Red wire). (Scheme 29) If continuity does not exist, repair open in Light Green/Red wire. If continuity exists, go to next step.
  7. Check Ground Circuits (High Speed) Turn ignition off. Disconnect cooling fan motor No. 1 and 2 harness connectors. (Scheme 24) Using an ohmmeter, check continuity between fan motor No. 1 harness connector terminal "b" and fan relay No. 2 harness connector, terminal No. 5 (White/Yellow wire). (Scheme 27)and (Scheme 28). If continuity does not exist, repair open in White/Yellow wire. If continuity exists, check continuity between fan motor No. 2 harness connector terminal "f" and fan relay No. 3 harness connector, terminal No. 5 (White/Blue wire). If continuity does not exist, repair open in White/Blue wire. If continuity exists, go to next step.
  8. Check Power Supply (High Speed) Disconnect cooling fan relays No. 2 and 3. (Scheme 28) Turn ignition on. Using a voltmeter, measure voltage between fan relay No. 2 harness connector, terminal No. 1 (Gray/Yellow wire) and ground. (Scheme 28) If battery voltage is not present, check for open/short in Gray/Yellow wire, blown fuse No. 4 (10-Amp), burnt 30-amp fusible link, or faulty joint connector No. 1 or No. 2. If battery voltage is present, go to next step.
  9. Using a voltmeter, measure voltage between fan relay No. 2 harness connector, terminal No. 3 (White/Green wire) and ground. (Scheme 28) If battery voltage is not present, check for open/short in Gray/Yellow wire, blown fuse No. 4 (10 Amp), burnt 30 amp fusible link, or faulty joint connector No. 1 or No. 2. If battery voltage is present, go to next step.
  10. Check Output Signal Circuit (High Speed) Disconnect ECM harness connector. Check continuity between ECM harness connector terminal No. 13 and fan relay No. 2 harness connector, terminal No. 2 (Light Green wire). (Scheme 29) If continuity does not exist, repair open in Light Green wire. If continuity exists, go to next step.
  11. Check Components Inspect cooling fan relay No. 1. Connect battery voltage between relay terminals No. 1 and No. 2. (Scheme 27) Using an ohmmeter, check continuity between terminals No. 3 and No. 5. If continuity does not exist, replace fan relay No. 1.
  12. Inspect cooling fan relays No. 2 and 3. Connect battery voltage between terminals No. 1 and No. 2. (Scheme 28) Check continuity between terminals No. 3 and No. 5 and terminals No. 6 and No. 7. If continuity does not exist, replace faulty relay. If continuity exists, go to next step.
  13. Inspect cooling fan motors. Disconnect cooling fan motor harness connectors. Connect battery voltage to terminal "a" of appropriate fan motor. (Scheme 29) Connect ground terminal of battery to terminal "d" of fan motor. Fan motor should operate at low speed.
  14. Connect battery voltage to terminal "a" and negative terminal of battery to terminal "c" of fan motor. (Scheme 29) Fan motor should operate at high speed. Connect positive terminal of battery to terminal "b" and negative terminal of battery to terminal "d" of fan motor. Fan motor should operate at high speed. If fan motor does operate as described, replace fan motor. If components are okay, check ECM pin terminals and/or wiring harness connectors.

Scheme 24

Scheme 24
Scheme 24

Scheme 25

Scheme 25
Scheme 25

Scheme 26

Scheme 26
Scheme 26

Scheme 27

Scheme 27
Scheme 27

Scheme 28

Scheme 28
Scheme 28

Scheme 29

Scheme 29
Scheme 29

Note. Cooling fan circuit diagnosis procedure for 1998 Maxima is not available from manufacturer. For wiring diagram, see WIRING DIAGRAMS .

COOLING FAN CIRCUIT (SENTRA & 200SX - 1.6L)

  1. Check Cooling Fan Operation Start engine. Turn A/C switch and blower fan switch on. Verify cooling fan operates. If fan operates, go to step 7). If fan does not operate, go to next step.
  2. Check Ground Circuit Turn ignition on. Disconnect cooling fan motors No. 1 and 2 harness connectors. Using an ohmmeter, check continuity between fan motor No. 1 harness connector terminal No. 1 and fan relay No. 1 harness connector, terminal No. 5 (Green/Black wire). If continuity does not exist, repair open in Green/Black wire. If continuity exists, check continuity between fan motor No. 2 harness connector terminal No. 1 and fan relay No. 1 harness connector, terminal No. 5 (Green/Black wire). If continuity does not exist, repair open Green/Black wire. If continuity exists, go to next step.
  3. Check continuity between fan motor No. 1 and 2 harness connectors terminal No. 2 (Black wire) and ground. If continuity does not exist, repair open in Black wire. If continuity exists, go to next step.
  4. Check Power Supply Turn ignition off. Disconnect cooling fan relay No. 1. Turn ignition on. Using a voltmeter, check voltage between cooling fan relay No. 1 harness connector, terminal No. 1 (Brown wire) and ground. If battery voltage is not present, check for blown fuse No. 21 or fault in Brown wire. Repair or replace as required. If battery voltage is present, check voltage between cooling fan relay No. 1 harness connector, terminal No. 3 (Green wire) and ground. If battery voltage is not present, check for burnt fusible link "e" or fault in Green wire. Repair or replace as required. If battery voltage is present, go to next step.
  5. Check Output Signal Circuit Disconnect ECM harness connector. Check continuity between ECM harness connector terminal No. 14 and cooling fan relay No. 1 harness connector, terminal No. 2 (Light Green/Red wire). If continuity does not exist, repair open in Light Green/Red wire. If continuity exists, go to next step.
  6. Check Components Inspect cooling fan relay No. 1 and cooling fan motors No. 1 and 2. Replace relays and motors as required. Apply pressure to cooling system using tester. Pressure should not drop. Repair as required. Test radiator cap using cap tester. Replace as required. Inspect thermostat and ECT sensor. Disconnect and reconnect harness connectors in circuit and retest system.

Scheme 30

Scheme 30
Scheme 30

COOLING FAN CIRCUIT (SENTRA & 200SX - 2.0L)

  1. Check Low Speed (A/T) And High Speed (M/T) Fan Operation Turn ignition off. Disconnect cooling fan relays No. 2 and 3. Start engine. Set temperature lever to full cold position. Turn A/C switch and blower fan switch to ON position. Run engine at idle for several minutes. Verify cooling fan operates at low speed for A/T models and high speed for M/T models. If fan does not operate as specified, go to step 4). If fan operates as specified, go to next step.
  2. Check High Speed Fan Operation (A/T) Turn ignition off. Reconnect cooling fan relays No. 2 and 3. Disconnect cooling fan relay No. 1. Turn ignition on. Turn A/C switch and blower fan switch to OFF position. Disconnect Engine Coolant Temperature (ECT) sensor harness connector. Connect a 150-ohm resistor across ECT sensor harness connector terminals. Restart engine. Verify cooling fan operates at high speed. If fan does not operate at high speed, go to step 6). If fan operates at high speed, check cooling system for leaks, radiator cap pressure and thermostat operation. Repair as necessary. Inspect ECT sensor. Replace as necessary.
  3. Check Ground Circuit Turn ignition off. Disconnect cooling fan motors No. 1 and 2 harness connectors. Using an ohmmeter, check continuity between fan motor No. 1 harness connector terminal No. 1 and fan relay No. 1 harness connector, terminal No. 5 (Green/Black wire). See «WIRING DIAGRAMS»(ref-129789-S28083836992001112000000) . If continuity does not exist, repair open in Green/Black wire. If continuity exists, check continuity between fan motor No. 2 harness connector terminal No. 1 and fan relay No. 1 harness connector, terminal No. 5 (Green/Black wire). If continuity does not exist, repair open in Green/Black wire. If continuity exists, go to next step.
  4. Check continuity between fan motor harness connector terminal No. 2 on M/T models (Black wire) and terminal No. 4 (Black wire) on A/T models and ground. If continuity does not exist, repair open in Black wire. If continuity exists, go to next step.
  5. Check Power Supply Turn ignition off. Disconnect cooling fan relay No. 1. Turn ignition on. Using a voltmeter, check voltage between cooling fan relay No. 1 harness connector, terminal No. 1 (Brown wire) and ground. If battery voltage is not present, check for blown fuse No. 21 or fault in Brown wire. Repair or replace as required. If battery voltage is present, check voltage between cooling fan relay No. 1 harness connector, terminal No. 3 (Green wire) and ground. If battery voltage is not present, check for burnt fusible link "e" or fault in Green wire. Repair or replace as required. If battery voltage is present, go to next step.
  6. Check Output Signal Circuit Disconnect ECM harness connector. Check continuity between ECM harness connector terminal No. 14 and cooling fan relay No. 1 harness connector, terminal No. 2 (Light Green/Red wire). If continuity does not exist, repair open in Light Green/Red wire. If continuity exists, go to next step.
  7. Check Ground Circuits (High Speed) Turn ignition off. Disconnect cooling fan motor No. 1 and 2 harness connectors. Check continuity between fan motor No. 1 harness connector terminal No. 2 and fan relay No. 2 harness connector, terminal No. 5 (Green/Yellow wire). If continuity does not exist, repair open in Green/Yellow wire. If continuity exists, check continuity between fan motor No. 2 harness connector terminal No. 3 and fan relay No. 3 harness connector, terminal No. 5 (Light Green/Blue wire). If continuity does not exist, repair open in Light Green/Blue wire. If continuity exists, go to next step.
  8. Check Output Signal Circuit (High Speed) Disconnect ECM harness connector. Check continuity between ECM harness connector terminal No. 13 and fan relay No. 2 harness connector, terminal No. 2 (Light Green wire). See «WIRING DIAGRAMS»(ref-129789-S28083836992001112000000) . If continuity does not exist, repair open in Light Green wire. If continuity exists, check continuity between ECM harness connector terminal No. 14 and fan relay No. 1 harness connector, terminal No. 2 (Light Green/Red wire). If continuity does not exist, repair open in Light Green/Red wire. If continuity exists, go to next step.
  9. Check Components Inspect cooling fan relay No. 1 and cooling fan motors No. 1 and 2. Replace relays and motors as required. Apply pressure to cooling system using tester. Pressure should not drop. Repair as required. Test radiator cap using cap tester. Replace as required. Inspect thermostat and ECT sensor. Disconnect and reconnect harness connectors in circuit. Retest system.

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