Service Infiniti QX4 since 1996 of release
1. Introduction
2. The maintenance instruction
3. Routine maintenance
4. The engine
5. Cooling and heating systems
5.1. Specifications
5.2. Antifreeze - the general data
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 an automatic air conditioning – a design and a functioning principle
5.10. A design of a refrigerator path of a central air of air
5.11. Compressor K/V, - the general information and a functioning principle
5.12. The Receiver-dehumidifier - the general information and service
5.13. Check of serviceability of functioning and service of systems of heating and an air conditioning
5.14. Diagnostics of a central air of air
6. Power supply systems and managements
7. Start and charge systems
8. A transmissionnaja line
9. Brake system
10. A suspension bracket and a steering
11. A body
12. An electric equipment


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

Do not start performance of procedures before full cooling of the engine. The prevention in section Antifreeze - the general data see also.


The scheme of installation of a radiator of system of cooling



  1. Disconnect a negative wire from the battery.
  2. Cock a lay brake and prop up back wheels противооткатными boots. Поддомкратьте redock of the car also establish it on props (the Scheme of an institution of props for car fixing in the lifted position see an illustration). Remove the bottom antispray screen of an impellent compartment.
  3. Empty cooling system (Routine maintenance see the Head), — if mix replacement was made recently, keep it for the further use (Antifreeze - the general data, the Prevention see).
  4. Remove the air sleeve going from the gauge of measurement of weight of air (MAF) to the case of a throttle.
  5. Disconnect top and bottom радиаторные hoses.
  6. Disconnect from a radiator of a line of a path of cooling ATF, — prepare for gathering of a spilt 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 переливной a hose of a broad tank.
  9. Cautiously remove a radiator and take it from an impellent compartment. Try not to spill cooling liquid on painted кузовные panels and do not cut fingers about sharp plates of the heat exchanger.
  10. After removal from the car the radiator can be checked up on presence of signs of leaks, damages and infringements of internal passableness of the heat exchanger. Any repair should be made only in the conditions of a specialised workshop with application of the necessary equipment.
  11. Remains of insects and vegetation can be removed from space between plates of the heat exchanger by blowing by the compressed air (do not forget to put on goggles!), or вычищения a soft brush. Try not to bend thin plates of the heat exchanger and not to cut about them fingers.
  12. Check up 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 the thickness of 1.5 mm, width 18 mm and length 8.5 mm. Make sure that the backlash смыкания sponges of nippers Н makes an order of 7.6 mm, — in case of need correct a course смыкания 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 upwards 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 радиаторного a tank
    B — At bending back of fixing edge upwards 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 perimetre will bend top, remove from the heat exchanger cooler ATF.


The scheme of capture of fixing edge sponges of nippers



  1. Establish into place cooler ATF, pay attention to correctness of installation of a conic washer.
  1. Smooth out a landing surface of the heat exchanger, carefully having blown its compressed air.
  1. Lay a new sealant, — fill an element only with fingers, try not to damage rubber. Track, that the rubber sealing element has not appeared is overwound.
  1. Зачеканьте fixing edge of a tank in strictly certain places, — track correctness of capture of metal sponges of nippers (the Scheme of capture of fixing edge sponges of nippers see an illustration). 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 perimetre.

Tightness check


  1. Through a jellied mouth закачайте in a radiator air under pressure in 157 кПа, a suitable hose close among themselves reception unions of cooler ATF.
  1. Then lower assemblage 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 in an order, the return to an order of dismantle of components, — track correctness of placing of a radiator on the support.
  2. On installation end fill in in system cooling liquid of demanded structure (Routine maintenance see the Head), in case of need let out from a path air stoppers through the special final gate.
  3. Start the engine and check up it on presence of signs of leaks. Warm up the engine to normal working temperature (both hoses of a radiator should become hot to the touch). Check up level of a cooling liquid, in case of need add corresponding quantity of a mix.
  4. Check up level ATF, in case of need add (Routine maintenance) see the Head.
  1. In summary check up tightness of a cover of a jellied mouth of a radiator pressure.

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