Nissan Maxima QX

since 1993 of release

Repair and car operation

Nissan Maxima QX
+ Nissan Maxima brand Cars
+ Maintenance instruction
+ Settings and routine maintenance
+ Engine
- Systems of cooling, heating
   General information
   Antifreeze - general information
   Check of serviceability of functioning and thermostat replacement
   Check of a condition of fans of system of cooling and chains of their inclusion, replacement of components
   Removal and installation of a radiator and expanded tank of system of cooling
   Check of a condition and replacement of the water pump
   Check of serviceability of functioning and replacement of the block of the sensor of a measuring instrument of temperature of cooling liquid
   Check of serviceability of functioning of the driving electromotor of the fan of a heater and condition of components of its electric chain, …
   Removal and installation of the electromotor of a drive of the fan of a heater
   Removal and installation of assembly of the control panel by functioning of a heater and air conditioner, adjustment of a driving cable
   Removal and installation of the heat exchanger of a heater
   Check of serviceability of functioning and service of systems of heating and air conditioning
   Removal and receiver dehumidifier installation To/in
   Removal, service and To/in compressor installation
   Removal and To/in condenser installation
+ Power supply system and release
+ engine Electric equipment
+ Control systems of the engine
+ Transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment


Check of serviceability of functioning and thermostat replacement

Do not open a cover of a radiator and do not remove the thermostat before complete cooling of the engine! See also prevention at the beginning of the Section Antifreeze - general information.



1. Before finally affirming as opinion on a thermostat exit out of operation, check level of cooling liquid in system, a condition and effort of a tension of a driving belt (see. Head of Control and routine maintenance), and also serviceability of functioning of a measuring instrument of temperature.
2. One of possible the reason of too slow warming up of the engine (according to measuring instrument indications) is thermostat jamming in open situation. Replace the thermostat new.
3. In case of an overheat of the engine touch a hand the top hose of a radiator. If the hose is not heated up, possibly, the thermostat is jammed in a closed position, blocking circulation of cooling liquid through a radiator. Replace the thermostat.

At all do not maintain the car with the removed thermostat! Feedback of the onboard processor that will lead to increase of toxicity of the fulfilled gases and excessive increase in fuel consumption thus can become torn.

4. If the top hose is heated up, it means that cooling liquid regularly circulates through a radiator, i.e. the thermostat is open. Address to materials of the Section devoted to diagnostics of malfunctions of system of cooling.

5. For carrying out more detailed check the thermostat is necessary for removing from the engine. If the thermostat remains open at room temperature, it should be replaced.

6. Tie up a string piece to thermostat assembly (the valve should be in a closed position) and lower the last in the heat-resistant container with cold water, there place the thermometer.

7. Establish the container on a plate and start to watch behavior of the valve, at the same time watching thermometer indications.

The thermometer, the thermostat should not concern container walls!

8. Mark the thermometer indication during the moments of the beginning of opening and complete opening of the valve. Compare results of measurements to requirements of Specifications.

On the case of the thermostat the nominal rate of temperature of complete opening of the valve is usually beaten out. Beginnings of opening also given on temperature and size of opening of the valve can be specified.

9. It is faulty functioning assembly replace.



1. Disconnect a negative wire from the battery.

If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that have the correct combination for audiosystem input in action!

2. Merge cooling liquid from a radiator and the engine block (see. Head of Control and routine maintenance). If replacement of a mix was made recently, keep it for further use.
3. On SOHC engines disconnect the top radiatorny hose from a branch pipe of production of water on the inlet pipeline and from a radiator, then release an intermediate clamp on a forward cover of a drive of GRM and remove a hose. Disconnect perepuskny a hose from a thermostat cover.
4. On DOHC engines remove driving belts and an arm of an intermediate roller. Also remove the bottom hose of a radiator and turn out from the wall of the block turned forward on the car a drain stopper of the water pump.
5. Uncover the thermostat, - try to remember its adjusting situation. Prepare for collecting spilled liquid.

6. Remove the thermostat, - remember its adjusting situation.

7. Carefully smooth out sealing surfaces of a cover and a thermostat casing a scraper, then wipe their rags moistened in solvent.

8. Impose on perimeter of an interfaced surface of a cover a RTV hermetic pillow. Develop the thermostat so that that the plunzher of the valve of pumping appeared in the top point, establish it on the regular place in a cover/casing and within five minutes after hermetic imposing приболтите a cover to a casing.

9. Further installation is made as it should be the return to an order of dismantle of components. Track, that all fixture was tightened with demanded effort, and hoses are connected correctly.
10. Let's to hermetic stiffen during about half an hour, fill system of cooling and let out from it air jams (see. Head of Control and routine maintenance). Start the engine and check it on existence of leaks and serviceability of functioning of the thermostat.