Nissan Versa

 Sedan Service Manual

Engine » Engine cooling system (CO)
Thermostat

Exploded View

1. Radiator hose (lower) 2. Water inlet 3. Rubber ring 4. Thermostat A. To radiator

Removal and Installation

WARNING:

Do not remove the radiator cap when the engine is hot. Serious burns could occur from highpressure engine coolant escaping from the radiator. Wrap a thick cloth around the radiator cap. Slowly turn it a quarter of a turn to release builtup pressure. Carefully remove radiator cap by turning it all the way.

REMOVAL

1. Drain engine coolant from radiator.

   CAUTION: - Perform this step when engine is cold.

   - Do not spill engine coolant on drive belt.

2. Remove air duct.
3. Remove oil level gauge and guide.
4. Disconnect radiator hose (lower) from water inlet.
5. Remove water inlet, thermostat, and rubber ring.

   NOTE: Engine coolant will leak from cylinder block, so have a receptacle ready below.

INSPECTION AFTER REMOVAL

Thermostat

• Place a thread (A) so that it is caught in the valves of thermostat (1). Immerse fully in a container (B) filled with water. Heat while stirring.
• The valve opening temperature is the temperature at which the valve opens and falls from the thread.
• Continue heating. Check the full open valve lift amount.
• After checking the maximum valve lift amount, lower the water temperature and check the valve closing temperature.

• If out of the standard specification range, replace the thermostat.

INSTALLATION

Installation is in the reverse order of removal.

Thermostat

• Install thermostat making sure rubber ring (1) groove fits securely to thermostat flange (A).

  CAUTION: Do not reuse rubber ring.

• Install thermostat (2) into the cylinder block (1) with jiggle valve (A) facing upward.

Water Inlet After installation, attach the water inlet clip (A) on the oil level gauge guide (1) positioned at location (B) as shown.

INSPECTION AFTER INSTALLATION

• Before starting engine, check oil/fluid levels, including engine coolant and engine oil. If less than required quantity, fill to the specified level.
• Use procedure below to check for fuel leakage.
• Turn ignition switch ON (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leakage at connection points.
• Start engine. With engine speed increased, check again for fuel leakage at connection points.
• Run engine to check for unusual noise and vibration.

  NOTE: If hydraulic pressure inside timing chain tensioner drops after removal and installation, slack in the guide may generate a pounding noise during and just after engine start. However, this is normal. Noise will stop after hydraulic pressure rises.

• Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gas, or any oils/fluids, including engine oil and engine coolant.
• Bleed air from passages in lines and hoses, such as in cooling system.
• After cooling down engine, again check oil/fluid levels, including engine oil and engine coolant. Refill to specified level, if necessary.
• Summary of the inspection items:

Item		Before starting engine	Engine running	After engine stopped
Engine coolant		Level	Leakage	Level
Engine oil		Level	Leakage	Level
Transmission/ transaxle fluid	A/T and CVT Models	Leakage	Level/Leakage	Leakage
	M/T Models	Level/Leakage	Leakage	Level/Leakage
Other oils and fluids*		Level	Leakage	Level
Fuel		Leakage	Leakage	Leakage
Exhaust gas			Leakage

Precaution

Description

Engine coolant

Radiator

Cooling fan

Water pump

Thermostat

Water outlet