Infiniti QX4 service since 1996 of release
1. Introduction
2. Maintenance instruction
3. Routine maintenance
4. Engine
5. Cooling and heating systems
5.1. Specifications
5.2. Antifreeze - general information
5.3. Service of system of cooling
5.4. Removal, installation and check of serviceability of functioning of the thermostat
5.5. Removal, regenerative repair and installation of a radiator of system of cooling
5.6. Replacement of the water pump
5.7. Removal and installation of the fan of system of cooling
5.8. Air lines of distribution of air submitted to salon
5.9. System of automatic air conditioning – a design and a functioning principle
5.10. Design of a refrigerator path of central air of air
5.11. The To/in compressor, - the general information and a functioning principle
5.12. A receiver dehumidifier - the general information and service
5.13. Check of serviceability of functioning and service of systems of heating and air conditioning
5.14. Diagnostics of central air of air
6. Power supply systems and managements
7. Start and charge systems
8. Transmission line
9. Brake system
10. Suspension bracket and steering
11. Body
12. Electric equipment



5.5. Removal, regenerative repair and installation of a radiator of system of cooling

Do not start performance of procedures before complete cooling of the engine. See also prevention in the section Antifreeze - general information.


Scheme of installation of a radiator of system of cooling



  1. Disconnect a negative wire from the battery.
  2. Cock the parking brake and prop up back wheels protivootkatny boots. To Poddomkratta a car front also establish it on props (see an illustration the Scheme of an institution of props for car fixing in the lifted situation). Remove the bottom antispray screen of an impellent compartment.
  3. Empty cooling system (see. Head Routine maintenance) — if replacement of a mix was made recently, keep it for further use (see. Antifreeze - general information, the Prevention).
  4. Remove the air sleeve going from the sensor of measurement of weight of air (MAF) to the case of a throttle.
  5. Disconnect the top and bottom radiatorny hoses.
  6. Disconnect from a radiator of the line of a path of cooling of ATF — prepare for collecting spilled liquid, at once закупорьте the open ends of tubes and unions.
  7. Remove the bottom section of a casing of the fan of system of cooling.
  8. Disconnect perelivny a hose of a broad tank.
  9. Carefully remove a radiator and take it from an impellent compartment. Try not to spill cooling liquid on the painted body panels and do not cut fingers about sharp plates of the heat exchanger.
  10. After removal from the car the radiator can be checked on existence of signs of leaks, damages and violations of internal passableness of the heat exchanger. Any repair should be made only in the conditions of a specialized workshop with use of the necessary equipment.
  11. Remains of insects and vegetation can be removed from space between heat exchanger plates a way of blowing by the compressed air (do not forget to put on goggles!), or vychishcheniye soft brush. Try not to bend thin plates of the heat exchanger and not to cut about them fingers.
  12. Check a condition of rubber support of a radiator, in case of need make replacement of the failed components.


Radiator design



  1. Fix on sponges of special nippers a remote nozzle in thickness of 1.5 mm, width of 18 mm and length of 8.5 mm. Make sure that the gap of a smykaniye of sponges of nippers of N makes about 7.6 mm — in case of need correct a smykaniye course by means of a nozzle.
  1. By means of the special tool remove the top tank of a radiator — at bending back of the bent edge of a tank up nippers should slide off. In hard-to-reach spots bending back of fixing edge can be made by means of a screw-driver — try not to damage a tank.

    A — Removal of a radiatorny tank
    B — At bending back of fixing edge up nippers should slide off automatically



Do not unbend edge more strongly, than it is really necessary for tank removal!

  1. Having made sure that fixing edge on all perimeter will bend top, remove from the heat exchanger ATF cooler.


Scheme of capture of fixing edge sponges of nippers



  1. Establish into place ATF cooler, pay attention to correctness of installation of a conic washer.
  1. Smooth out a landing surface of the heat exchanger, having carefully blown it the compressed air.
  1. Lay a new sealant — fill an element only with fingers, try not to damage rubber. Track, that the rubber sealing element did not appear is overwound.
  1. To Zachekanta fixing edge of a tank in strictly certain places — track correctness of capture of metal sponges of nippers (see an illustration the Scheme of capture of fixing edge sponges of nippers). In places remote for nippers bend fixing edge of a tank by means of flat-nose pliers.
  1. Make sure that fixing edge will bend properly on all perimeter.

Tightness check


  1. Through a jellied mouth pump in a radiator air under pressure in 157 kPas, a suitable hose close among themselves reception unions of a cooler of ATF.
  1. Then omit assembly in the capacity filled with water for check of its tightness.
  1. In case of need correct a bend of fixing edge of a tank.



  1. Installation is made as it should be, the return to an order of dismantle of components — track correctness of placement of a radiator on the support.
  2. On completion of installation fill in in system cooling liquid of demanded structure (see. Head Routine maintenance), in case of need let out from a path air jams via the special final gate.
  3. Start the engine and check it on existence of signs of leaks. Warm up the engine to normal working temperature (both hoses of a radiator should become hot to the touch). Check level of cooling liquid, in case of need add the corresponding quantity of a mix.
  4. Check ATF level, in case of need add (see. Head Routine maintenance).
  1. In summary check tightness of a cover of a jellied mouth of a radiator pressure.

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5.4. Removal, installation and check of serviceability of functioning of the thermostat
on the following page»
5.6. Replacement of the water pump