Nissan Sentra Service Manual: Periodic maintenance
ENGINE COOLANT
System Inspection
WARNING:
- Do not remove the radiator cap when the engine is hot. Serious
burns could occur from high pressure
engine coolant escaping from the radiator.
- Wrap a thick cloth around the cap. Slowly push down and turn it
a quarter turn to allow built-up pressure
to escape. Carefully remove the cap by pushing down and turning it all the
way.
CHECKING COOLING SYSTEM HOSES
Check hoses for the following:
- Improper attachment
- Leaks
- Cracks
- Damage
- Loose connections
- Chafing
- Deterioration
Checking reservoir level
- Check if the reservoir tank engine coolant level is within MIN to
MAX when the engine is cool.
- Adjust engine coolant level if it is too much or too little.
Checking cooling system for leaks
To check for leaks, apply pressure to the cooling system using suitable
tool (A) and Tool (B).
Tool number : EG17650301 (J-33984-A)
Testing pressure : Refer to CO-28, "Radiator".
WARNING:
Do not remove the radiator cap when the engine is hot. Serious
burns could occur from high pressure engine coolant escaping
from the radiator.
CAUTION:
Higher pressure than specified may cause radiator damage.
Checking radiator CAP
- Inspect the radiator cap.
- Replace the cap if the metal plunger cannot be seen around the edge of
the black rubber gasket.
- Replace the cap if deposits of waxy residue or other foreign material
are on the black rubber gasket or
the metal retainer.
NOTE:
Thoroughly wipe out the radiator filler neck to remove any waxy residue or
foreign material.
- 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.
Negative pressure: Refer to CO-28, "Radiator".
- Check radiator cap relief pressure using suitable tool and Tool.
Tool number : EG17650301 (J-33984-A)
Positive pressure (relief): Refer to CO-28, "Radiator".
- When connecting the radiator cap to the tester, apply water or
engine coolant to the cap seal surface.
- Replace the radiator cap if there is an abnormality in the negative-
pressure valve, or if the open-valve pressure is outside of
the standard values.
Checking radiator
Check radiator for mud or clogging. If necessary, clean radiator as follows.
CAUTION:
- Spray water to the back side of the radiator core using a side to side
motion from the top down.
- Stop spraying when debris no longer flows from radiator core.
- Blow air into the back side of radiator core using a side to side motion
from the top down.
- Use compressed air lower than 490 kPa (5 kg/cm2, 71 psi) and keep
distance more than 30 cm (11.8 in).
- Continue to blow air until no water sprays out.
- Check for engine coolant leaks. Repair as necessary.
Changing Engine Coolant
WARNING:
- To avoid being scalded, do not change the engine 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 push down and turn the cap all the way to
remove.
Draining engine coolant
- Remove the engine under cover. Refer to EXT-16, "Exploded View".
- Open the radiator drain plug (1) at the bottom of the radiator and
remove the radiator filler cap. This is the only step required
when partially draining the cooling system (radiator only).
CAUTION:
- Do not spill engine coolant on the drive belt.
- Perform this step when the engine is cold.
- Follow this step for heater core removal/replacement only. Disconnect
the upper heater hose at the
engine side and apply moderate air pressure [103.46 kPa (1.055 kg/cm2, 15
psi) maximum air pressure]
into the hose for 30 seconds to blow the excess engine coolant out of the
heater core.
- When draining all of the engine coolant in the system, remove the
reservoir tank and drain the engine
coolant, then clean the reservoir tank before installation.
CAUTION:
- Do not allow the engine coolant to contact the drive belt.
- Perform this step when engine is cold.
- When draining all of the engine coolant in the system for engine removal
or repair, remove the engine
coolant drain plugs on the cylinder block.
- Check the drained engine coolant for contaminants such as rust,
corrosion or discoloration.
If the engine coolant is contaminated, flush the engine cooling system.
Refilling engine coolant
- Install the radiator drain plug. Install the reservoir tank and cylinder
block drain plug, if removed for a total
system drain or for engine removal or repair.
- The radiator must be completely empty of engine coolant and water.
- Apply sealant to the threads of the cylinder block drain plug. Use
Genuine High Performance
Thread Sealant or equivalent. Refer to MA-11, "Fluids and Lubricants".
Radiator drain plug : Refer to CO-15, "Exploded View".
- If disconnected, reattach the upper radiator hose at the engine side.
- Set the vehicle heater controls to the full HOT and heater ON position.
Turn the vehicle ignition ON with
the engine OFF as necessary to activate the heater mode.
- Install the Tool by installing the radiator cap adapter onto the
radiator neck opening. Then attach the gauge body assembly
with the refill tube and the venturi assembly to the radiator cap
adapter.
Tool number : KV991J0070 (J-45695)
- Insert the refill hose into the engine coolant mixture container
that is placed at floor level. Make sure the ball valve is in the
closed position.
Engine coolant capacity
(with reservoir tank)
: Refer to CO-28, "Periodical
Maintenance Specification".
CAUTION:
Do not use any cooling system additives such as radiator
sealer. Additives may clog the cooling system and cause
damage to the engine, transmission and/or cooling system.
- Install an air hose to the venturi assembly, the air pressure must
be within specification.
Compressed air
supply pressure
: 549 - 824 kPa (5.6 - 8.4 kg/cm2,
80 - 119 psi)
CAUTION:
The compressed air supply must be equipped with an air dryer.
- The vacuum gauge will begin to rise and there will be an audible hissing
noise. During this process open
the ball valve on the refill hose slightly. Engine coolant will be visible
rising in the refill hose. Once the refill
hose is full of engine coolant, close the ball valve. This will purge any
air trapped in the refill hose.
- Continue to draw the vacuum until the gauge reaches 28 inches
of vacuum. The gauge may not reach 28 inches in high altitude
locations, use the vacuum specifications based on the altitude
above sea level.
- When the vacuum gauge has reached the specified amount, disconnect the
air hose and wait 20 seconds
to see if the system loses any vacuum. If the vacuum level drops, perform
any necessary repairs to the
system and repeat steps 6 - 8 to bring the vacuum to the specified amount.
Recheck for any leaks.
- Place the engine coolant container (with the refill hose inserted) at
the same level as the top of the radiator.
Then open the ball valve on the refill hose so the engine coolant will be
drawn up to fill the cooling system.
The cooling system is full when the vacuum gauge reads zero.
CAUTION:
Do not allow the engine coolant container to get too low when filling,
to avoid air from being drawn
into the cooling system.
- Remove the Tool from the radiator neck opening.
- Fill the cooling system reservoir tank to the specified level and
install the radiator cap. Run the engine to
warm up the cooling system and top up the system as necessary.
- Install the engine under cover. Refer to EXT-16, "Exploded View".
Flushing cooling system
- Fill the radiator from the filler neck above the radiator upper hose and
reservoir tank with clean water and
reinstall the radiator filler cap.
- Run the engine until it reaches normal operating temperature.
- Rev the engine two or three times under no-load.
- Stop the engine and wait until it cools down.
- Drain the water from the system. Refer to CO-12, "Changing Engine
Coolant".
- Repeat steps 1 through 5 until clear water begins to drain from the
radiator.
OVERHEATING CAUSE ANALYSIS
Troubleshooting Chart
Symptom
Check items
Cooling system
parts
malfunction
Poor heat transfer
Water pump malfunction
Worn or lo ...
Other materials:
Ecu diagnosis information
Bcm
Reference value
NOTE:
The Signal Tech II Tool (J-50190) can be used to perform the following
functions. Refer to the Signal Tech II
User Guide for additional information.
Activate and display TPMS transmitter IDs
Display tire pressure reported by the TPMS transmitter
Read TPMS DTC ...
Front disc brake
Brake Burnishing
CAUTION:
Burnish contact surfaces between brake pads and disc rotor
according to the following procedure
after refinishing the disc rotor, replacing brake pads or if a soft pedal
occurs at very low mileage.
Be careful of vehicle speed. Brakes do not operate firmly/sec ...
Phone settings
To access the phone settings:
Press the [ ] button.
Touch the “Settings” key.
Touch the “Phone & Bluetooth” key.
Touch the “Phone Settings” key and adjust
the following settings as desired:
Sort Phonebook By:
Touch “First Name” or “Last Name” to
choose ...
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