The device, service, repair of Nissan Maxima QX - Check of serviceability of functioning and service of systems of heating and air conditioning//Maxim's Nissan (since 1993)

Nissan Maxima QX

since 1993 release

Repair and operation of the car



Nissan Maxima QX
+ Cars of the Nissan Maxima brand
+ Maintenance instruction
+ Settings and routine maintenance
+ Engine
- Cooling systems, heating
   General information
   Antifreeze - general information
   Check of serviceability of functioning and replacement of the thermostat
   Check of a condition of fans of the cooling system and chains of their inclusion, replacement of components
   Removal and installation of a radiator and expanded tank of the cooling system
   Check of a state and replacement of the water pump
   Check of serviceability of functioning and replacement of the block of the sensor of the measuring instrument of temperature of cooling liquid
   Check of serviceability of functioning of a driving electric motor of the fan of a heater and condition of components of its electric chain, …
   Removal and installation of an electric motor of the drive of the fan of a heater
   Removal and installation of assembly of the control panel of functioning of a heater and conditioner of air, 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 installation of a receiver dehumidifier To/in
   Removal, service and installation of the K/V compressor
   Removal and installation of the K/V condenser
+ 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 service of systems of heating and air conditioning

Air conditioning system

The air conditioning system constantly is under high pressure. Do not disconnect refrigerator lines at all and do not remove any components of system, previously without having executed a discharge of the last. The discharge of the air conditioning system has to be made by forces of the skilled expert in the conditions of a workshop of car service. At a rassoyedineniye of refrigerator lines surely put on goggles!

When replacing components of the air conditioning system the certain amount of replaceable refrigerator oil necessary for filling of volume of new knot will be required. Use only the oil good for the use in the R-134a systems (attentively study the label on a container). Remember that the epiploons intended for use in the systems filled by R-12 oil in this case do not approach.

Service

 PERFORMANCE ORDER

1. The listed below control checks have to be made on a regular basis for the purpose of maintenance of the air conditioning system in good repair:

a) Check a condition of a belt of the drive of the compressor. In case of detection of defects or signs of wear make replacement (see the Head Nastroyki and routine maintenance);
b) Check effort of a tension of a driving belt, in case of need make the corresponding adjustment (see the Head Nastroyki and routine maintenance);
c) Check hoses of a refrigerator path for existence of cracks, swellings, signs of hardening and aging of rubber, estimate a condition of nipple connections. Replace defective components;
d) Check condenser heat exchanger plates for existence of the remains of insects, old leaves and other garbage which got stuck between them. In case of need clean gaps a thin brush, or blow them compressed air;
e) Check system charge level;
f) In the presence of liquid potek around the dashboard, or on rugs check passability of a drainage tube of the evaporator.

2. The air conditioning system has to turn on at least for 10 minutes at least once a month (even in winter season). Long inaction To/in leads to hardening and failure of sealing rings and cuffs of a connecting path.
3. In view of complexity of a design of system and need of use of the special equipment, its service, deep diagnostics and recovery repair lie outside qualification of the average amateur mechanic and have to be made in the conditions of a workshop of car service. Only the elementary checks and replacements which are listed below in the present Section get to competence of the owner of the car.
4. To/in decrease in level of a charge of refrigerator oil is the most typical cause of infringement of serviceability of functioning.
5. The elementary checks given below will allow to reveal signs of decrease in level of coolant quickly.

CHECK

 PERFORMANCE ORDER

1. Warm up the engine up to the normal working temperature.
2. Include To/in on the maximum refrigerating capacity. Choose the maximum high-speed mode of the fan. Open doors to avoid cyclic shutdowns of system when cooling of the air volume closed in salon.
3. After temperature of system reaches working value, feel two tubes connected to the evaporator on a partition of a motive compartment.

4. Thinner tube going to the evaporator from the output union of the condenser has to be to the touch rather cold. The tube is thicker, going from the final union of the evaporator back to the compressor, has to be a little more (by 2 - 6 degrees) more cold. If the final tube is to the touch much warmer inlet, therefore, the system needs recharge. Enter the thermometer into an output air duct via the central deflector on the dashboard. At included To/in temperature of the air which is going out of the deflector has to be 19 - 22 degrees lower than ambient temperature (up to value of 4.5 °C). In very hot weather (+40 °C), increase in output temperature to the level of 15.7 °C, but is admissible no more. If the conditioner does not provide the required intensity of cooling of air, it is necessary to make recharge of system. For more detailed diagnostics of a condition of system the car should be driven away in a specialized workshop.

5. If intensity of cooling of the air given to salon is insufficient, the system probably needs recharge.
6. In the presence of signs of system crash check serviceability of functioning of coupling of the compressor.
7. Watching the forward party of the compressor, ask the assistant to include To / V. the clutch coupling has to publish distinct click, and its central part - to begin to rotate, otherwise kill the engine and disconnect the system pressure sensor switch. A wire crossing point close among themselves plugs of the socket and again turn on the conditioner. If now the system begins to function regularly, therefore pressure in it is excessively high or low, - drive away the car on car repair shop.
8. If the coupling still does not work, check a condition of the corresponding safety locks in the assembly block located in interior of the car.
9. Take from the assembly block of the relay of coupling of the compressor located in a motive compartment and check serviceability of its functioning (see the Head Onboard electric equipment). At the removed relay and the included ignition check serviceability of giving of food for two plugs of the relay in the assembly block (see schemes of electric connections at the end of the Head Onboard electric equipment).
10. By means of a wire crossing point connect the power plug of the relay of coupling of the compressor in the assembly block (see schemes of electric connections) to the corresponding plug of coupling - the coupling has to publish click. If there is no click, disconnect an electrical wiring from coupling and check serviceability of giving of food for its socket. Check serviceability of grounding of the plug of a black wire of the socket. If an electrical wiring as it should be, it is necessary to replace assembly of coupling of the compressor.
11. If all components and an electrical wiring as it should be, and the system is loaded to the required level, it is necessary to drive away the car on car repair shop for performance of diagnostics and recovery repair of RSM.
12. More detailed diagnostics of the air conditioning system lies outside qualification of the average amateur mechanic and its performance has to be entrusted to specialists of car service.

Coolant addition

For charging of the air conditioning system of the cars considered in the present manual it is necessary to use only refrigerator R-134a oil.


 PERFORMANCE ORDER

1. Prepare the standard charging R-134a set (ask in shops of automobile accessories). The valve nozzle and the piece of a hose connected between the gate and the union of a low pressure part of the refrigerator highway are a part of set a barrel with refrigerator oil of 12 ounces (ounce). As one barrel of oil it can appear insufficiently for final charging of system, it makes sense to buy just in case at once couple. Track that at least in one of barrels oil was tinted in red color that will allow to reveal quickly leak of coolant in case of those.

Do not fill more than two barrels of coolant in system at all!

2. According to instructions of manufacturers connect charging set to the LOW PRESSURE part of the refrigerator highway.
3. Close the gate on a transitional nozzle and screw the last on a barrel head, previously having made sure available a sealing ring / rubber laying.

Surely put on goggles!

4. Remove a dustproof cap from the union of a low pressure part of the refrigerator highway and connect to it the hose of charging set equipped with the socket of bystry joining.

The design of nipple knots will not allow to make connection of set to a high-pressure part of the highway.

5. Warm up the engine up to the normal working temperature and include К/В. Track that the hose of charging set did not adjoin to blades of fans of cooling systems of engine/air conditioning and other moving components in a motive compartment.

Charging of system has to be made at the working compressor. If the clutch coupling of the compressor is disconnected, the system should be switched to the maximum refrigerating capacity and to open all doors of salon.

That the compressor was not switched-off in the course of charging, disconnect the socket from the sensor switch of low pressure (on some models the combined sensor switch of a low/high pressure is used) and you peremknit it a paper clip or a piece of a rigid wire.

6. Rotation of a valve nozzle pierce a barrel head, having opened thereby coolant supply (the characteristic sound of the escaping gas has to be heard). In the course of all charging you discipline a barrel vertically, from time to time stirring up it. Between series of charging do the pause necessary for stabilization of system.

 Do not download more than two barrels of coolant in system at all! In order to avoid frosting of a barrel in the course of gas station wrap up its towel moistened in warm water.

7. In the presence of near at hand exact thermometer enter it in via the deflector into the central air duct To/in and you watch temperature of the air given to salon.
8. When the barrel becomes empty, block the gate and disconnect a hose from the low pressure union of system. At once put on a dustproof cap the union.
9. Disconnect a valve nozzle from a barrel, in case of need rearrange it on the second barrel and continue gas station. At the end of the procedure put an unfinished barrel vertically on a rack and as required use it for recharge of system.

System of heating

 PERFORMANCE ORDER

1. Moistening of a carpet on a floor under the heater heat exchanger, or a steam-out via deflectors of air ducts is told about leakages of the heat exchanger. Remove the heat exchanger (see the Section Removal and installation of the heat exchanger of a heater) and replace it new (the heater heat exchanger is not subject to recovery repair).
2. If the heater does not provide due heating of the air given to salon, one of the following can be the reason of such refusal:

a) The thermostat is jammed in open situation that does not allow the cooling liquid of the engine given to the heat exchanger of a heater to heat up to normal temperature. Replace the thermostat (see the Section Check of Serviceability of Functioning and Replacement of the Thermostat);
b) Violation of passability of a cooling path takes place that blocks supply of cooling liquid in the heater heat exchanger. Feel the hoses connected to branch pipes on a back partition of a motive compartment - both of them have to be hot, otherwise passability of a path is broken (hoses, the heat exchanger, or the operating heater gate are blocked). Disconnect hoses and make obratnopotochny washing of the heat exchanger. Previously having disconnected, wash out also both hoses;
c) If it is not possible to restore passability of the heat exchanger by washing, it is necessary to make its replacement (see the Section Removal and installation of the heat exchanger of a heater).

Elimination of smells of the air conditioning system

 PERFORMANCE ORDER

1. The unpleasant smells often arising at inclusion To/in are caused by formation of colonies of a mold on evaporator heat exchanger plates. The warm damp environment creates favorable conditions for emergence and development of fungal microorganisms.
2. Access to the evaporator heat exchanger on the majority of models is extremely limited. The procedure of the guaranteed full removal of a mold which is carried out in the conditions of a workshop of car service is rather labor-consuming, takes away a lot of time and demands use of strong disinfectants. In principle, rather effective processing can be executed also in house conditions by own forces of the owner of the car.
3. The special disinfectants in aerosol packaging intended for service of air conditioning systems can be bought practically in any shop of automobile accessories. It is necessary to remember that the price of means is usually directly proportional to its efficiency. Switch system to the mode of the closed air circulation and for ten minutes turn on the heater fan on the maximum speed. For the purpose of drying of system include heating on the maximum intensity. Disconnect an electrical wiring from the compressor for the purpose of prevention of its operation.

4. Giving of means is usually carried out through a long hose. Remove resistor assembly of an electric motor of the drive of the fan of a heater (see the Section Removal and installation of an electric motor of the drive of the fan of a heater), enter a nozzle of the giving nozzle into the formed opening and displace it to the left, having directed to the evaporator heat exchanger. Giving of means is carried out according to instructions of his manufacturer. Try to process all surface of the heat exchanger most fully. Duration of each operation cycle and intervals between series have to be specified on the label of a container.

5. The best preventive measure against emergence of colonies of a mold in the heat exchanger of the evaporator is regular check of passability of a drainage tube, and also short-term inclusion of the mode of removal of condensate after each distant trip with the working conditioner for the purpose of drying of the evaporator.

System of climate control

 PERFORMANCE ORDER

The system of climate control can be included in the additional package of the Nissan Maxima cars. Own processor obtaining necessary entrance data from various information sensors operates functioning of system. As well as RSM this processor includes the self-diagnostics block providing a possibility of bystry search and elimination of malfunctions. The operator chooses the required temperature condition and exposes it by means of the special handle on the control panel. Further the system begins to maintain automatically set air temperature in interior of the car, regulating as appropriate supply of cold and/or warm air. The high-speed mode of functioning of the fan is also controlled by the microprocessor via consistently switched on controller replacing in this case resistor assembly. Full failure diagnostics and repair of system of climate control lies outside qualification of the average amateur mechanic. However, the processor is equipped with the device of onboard self-diagnostics with a possibility of highlighting of codes of malfunction.