Nissan 100NX N14 silhouetteN14

Engine Cooling System - Refilling Engine Coolant

LC-4prose procedure

Air relief/bleed locations differ between SR engine, GA engine and CD engine (see figures).

Refilling Engine Coolant

  1. 1
    Set heater temperature control lever to Maximum Hot position.
  2. 2
    Remove radiator filler cap, air relief plug and air bleeder cap.
    Engine bay view of the SR engine showing the location of the air relief plug, with a leader line pointing to the plug.
  3. 3
    Fill radiator with coolant and fill reservoir tank to Max line with coolant.
    Air relief plug is reinstalled once coolant spills from the air relief hole during refill. Then fill radiator and reservoir tank with coolant.
  4. 4
    Reinstall air bleeder cap.
    Engine bay view showing the air bleeder cap and a clamp, both marked with an X symbol, with leader lines labeling 'Air bleeder cap' and 'Clamp'.
    SMA434C
  5. 5
    Install a temporary radiator filler cap which allows air and coolant in cooling system to be directed into reservoir tank regardless of pressure.
    Install a suitable steel wire between negative pressure valve and its seat as shown in the picture.
    Illustration of a temporary radiator filler cap fitted with a steel wire installed between the negative pressure valve and its seat to hold the valve open. Leader lines label 'Radiator filler cap', 'Negative pressure valve' and 'Steel wire'; an arrow shows the wire being inserted.
    SLC575A
  6. 6
    Warm up engine to normal operating temperature.
  7. 7
    Run engine at 2,500 rpm for 10 seconds and return to idle speed.
    Repeat 2 or 3 times
  8. 8
    Stop engine and cool it down.
    Watch coolant temperature gauge so as not to overheat the engine.
    Cool down using a fan to reduce the time.
  9. 9
    Remove the temporary radiator filler cap and check coolant level.
    If necessary, refill radiator up to filler neck with coolant.
  10. 10
    Refill reservoir tank to Max line with coolant.
  11. 11
    Repeat step 7 through step 10 two or more times.
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