Jeep Grand Cherokee

1993-1999 of release

Repair and car operation



Jeep Grand Cherokee
+ Cars of mark Jeep Grand Cherokee
+ Options and routine maintenance
+ Рядный the six-cylinder engine
+ Engine V8
+ Procedure of the general and engine major repairs
- Systems of cooling, heating and air conditioning
   The general information
   Antifreeze - the general information
   Check of functioning and thermostat replacement
   Check of serviceability and replacement of the fan of system of cooling and муфты its couplings
   Check of functioning and replacement of the block of the gauge of temperature of a cooler
   Removal and installation of a radiator and broad tank of system of cooling
   Check of functioning of the water pump
   Removal and installation of the water pump
   Check of serviceability of an electric contour and replacement of components of the motor of the fan of a heater and air conditioner
   Removal and installation of the block of the fan of a heater
   Removal and installation of assemblage of management by a heater and air conditioner
   Removal and installation of the heat exchanger of a heater
   Check of serviceability and service of systems of heating and air conditioning
   Diagnostics of system of automatic control in temperature (automatic telephone exchange) without its removal from the car
   Removal and installation of the accumulator (store) of a central air of air
   Removal and installation of the compressor of a central air of air
   Removal and installation of the condenser of a central air of air
   Removal and installation of a tube of the calibrated jet
   Removal and installation of the evaporator of a central air
+ The power supply system and release of the fulfilled gases
+ System of an electric equipment of the engine
+ Systems of decrease in toxicity of the fulfilled gases and engine management
+ Manual box of a gear change
+ Automatic transmission
+ Distributing box
+ Coupling and трансмиссионная a line
+ Brake system
+ Suspension bracket and steering
+ Body
+ System of an onboard electric equipment
+ Controls and operation receptions




The general information

System engine cooling

All models of cars considered in a given Management are equipped by system of cooling being under pressure with thermostatic management of circulation of a cooler. Rotornogo type the water pump fixed on a forward part of the block pumps over a cooler through the engine. The cooler stream washes each of cylinders and moves to a back part of the engine. Formed in block and head moulding (ок) cylinders water galleries provide distribution of a cooler and its giving to final ports, in areas of installation of spark plugs and an arrangement of directing plugs of final valves. In system of cooling of 6-cylinder engines the water pump of reversive type (with rotation in the opposite direction) is used.

The typical scheme of circulation of a cooler in system of cooling of engine V8


The typical scheme of circulation of a cooler in system of cooling of 6-cylinder type.

The thermostat воскозаполненного type is placed in the case and fixed in a forward part of the engine. In the course of warming up of the engine the thermostat is closed and prevents cooler circulation through a radiator. At approach of temperature of the engine to normal working value the thermostat opens, providing cooler pass through a radiator where it cools down before returning to the engine.

Hermetic sealing of system of cooling is provided by means of installation of a cover maintaining an elevated pressure on a radiator. Superfluous pressure in system provides increase of a boiling point of a cooler and improves efficiency of functioning of system. At excessive increase of pressure under its pressure there is an opening подпружиненного a safety valve in a cover and or superfluous pressure is dumped in atmosphere (the cover established on a broad tank on 6-cylinder engines in volume 4.0), or the cooler flows on a connecting tube in a broad tank.

The broad tank plays a double role. It is used as capacity where the fresh cooler is in case of need added and simultaneously provides поддерживание demanded level of a liquid in system, working as a receiver on reception of a cooler extending at an overheat. On 6-cylinder engines in volume of 4.0 l the broad tank is a part being under the pressure of a path of system of cooling through which there is a circulation of a cooler in the course of normal functioning of the engine.

Heating system

The heating system consists of the fan and the heat exchanger located in the case of a heater. The heat exchanger by means of hoses incorporates to system of cooling of the engine and a guard of management of air heater/conditioner on the panel of devices in car salon. Разогретый in the engine the cooler circulates through the heat exchanger. At heater inclusion in a mode of heating of its salon air заслонки open, providing connection of the case of a heater with car salon. By means of the switch on a management guard the fan of a heater which drives air through the heat exchanger to car salon is activated, providing that its heating.

Air central air

Air central air consists of the radiator of the condenser established on a forward part, the evaporator located in the neighbourhood with the heat exchanger of a heater, the compressor fixed on the engine, the accumulator serving for accumulation of a liquid phase of a coolant and a conclusion from system of surplus of a moisture, and also арматурных the lines connecting among themselves all components listed above.

The fan banishes разогретый air from car salon through the evaporator heat exchanger (working on a principle, a return principle of work of a radiator) where it gives the to coolant warmly being in the evaporator. A liquid coolant, beginning to boil, passes in a gaseous phase (evaporates) and, leaving the evaporator, takes away with itself warmth of phase transition.