CO-10
Revision: October 2006
ENGINE COOLANT
2006 Maxima
2. Pull the negative-pressure valve to open it and check that it
closes completely when released.
● Check that there is no dirt or damage on the valve seat of the
radiator cap negative-pressure valve.
● Check that there are no abnormalities in the opening and
closing conditions of the negative-pressure valve.
3. Check radiator cap relief pressure using Tool.
● When connecting the radiator cap to the tester, apply water or
coolant to the cap seal surface.
● Replace the radiator cap if there is an abnormality in the neg-
ative-pressure valve, or if the open-valve pressure is outside
of the standard values.
CHECKING RADIATOR
Check radiator for sludge or clogging. If necessary, clean radiator as follows:
● Be careful not to bend or damage the radiator fins.
● When radiator is cleaned without removing, remove all surrounding parts such as cooling fan shroud and
horns. Then tape the harness and electrical connectors to prevent water from entering.
1. Apply water by hose to the back side of the radiator core, with the hose pointed vertically downward.
2. Apply water again to all radiator core surfaces once per minute.
3. Stop washing if any dirt no longer rinse out from the radiator.
4. Blow air into the back side of radiator core, with the air hose pointed vertically downward.
● Use compressed air lower than 490 kPa (5 kg/cm
2
, 71 psi) and keep distance more than 30 cm (11.8
in).
5. Blow air again into all the radiator core surfaces once per minute until no water sprays out.
6. Check for leaks.
Changing Engine Coolant
EBS00RD9
WARNING:
● To avoid being scalded, never change the coolant when the engine is hot.
● Wrap a thick cloth around cap and carefully remove the cap. First, turn the cap a quarter of a turn
to release built-up pressure. Then turn the cap all the way.
DRAINING ENGINE COOLANT
1. Remove engine undercover, using power tools.
2. Open radiator drain plug at the bottom of radiator and remove
the radiator filler cap. This is the only step required for a partial
cooling system drain.
3. If removing the heater core, remove the upper heater hose from
the engine coolant outlet and apply moderate air pressure of 15
psi (103.46 kPa, 1.055 kg-cm
2
) maximum for 30 seconds into
the hose to blow out excess coolant from the core.
4. For a complete cooling system drain, remove the reservoir tank
and drain the coolant, and then clean the reservoir tank before
installation.
SMA967B
Tool number : EG17650301 (J-33984-A)
Standard: 78 – 98 kPa (0.8 – 1.0 kg/cm
2
, 11 – 14 psi)
Limit: 59 kPa (0.6 kg/cm
2
, 9 psi)
WBIA0570E
LBIA0063E
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