Jeep Grand Cherokee

1993-1999 of release

Repair and car operation

Check of serviceability and service of systems of heating and air conditioning

Constantly in a condition of maximum efficiency the following checks should be made for central air podderzhivaniye on a regular basis:

PERFORMANCE ORDER

Check a condition of a driving belt of the compressor. If the belt is worn-out or damaged, replace it (Head of Control and routine maintenance).
Check effort of a tension of a driving belt and, in case of need, make adjustment (Head of Control and routine maintenance).
Check system hoses on existence of cracks, swellings, traces of aging of a material and other damages. Examine the ends of hoses put on unions on existence of signs of infiltration and oil. In case of identification of signs of wear, damages or leaks replace a hose (and).
Check gaps between condenser plates on existence in them the got stuck old leaves, remains of insects and other garbage. Clean gaps by means of a special crest or blow them the compressed air.
Check correctness of level of a coolant in system.

It is necessary to include system at least once a month for the period of about 10 minutes, especially it belongs to a cold season when direct need for conditioning of salon is absent. Long non-use conducts to hardening and gradual failure of sealing laying of system.

To reveal leaks in system it is most easier after warming up and pressure lifting in it by five-minute inclusion of system in a mode of conditioning of salon at the working engine. Then switch off the engine and carefully examine all hoses of system and their shtutserny connections. Presence of oil traces usually speaks about existence of leakages of a coolant.

In view of complexity of a design of system and need of use of the special equipment for its service, deep diagnostics and repair, the description of the listed procedures is not included in this Management. However, the elementary checks and descriptions of procedures of replacement of some components are collected in this Chapter and are brought to attention of readers.

If central air does not function in general, check a condition of its safety locks in the assembly block and the relay of the conditioner which is located in a relay box in an impellent compartment.

The relay of central air of air is central (arrow) in a relay box in an impellent compartment.

More often decrease in efficiency of functioning of system appears connected with falling of level of the coolant charged in it. At appreciable decrease in overall performance of system one of offered below checks will help to reveal falling of level of a coolant quickly.

Check of level of a coolant

PERFORMANCE ORDER

Warm up the engine to normal working temperature.
Transfer the lever of a choice of a temperature mode of functioning of the conditioner to the maximum cold, then turn on on a maximum the heater fan. Open doors (in order to avoid automatic shutdown of system in process of air cooling in salon).
After turning on of the compressor - the coupling of its coupling will publish well heard click, and its central part will start to rotate - feel one hand an inlet tube of the evaporator between a tube of the calibrated jet and the evaporator, at the same time pressing the second hand to metal section of a hose between the evaporator and the accumulator (store) (see. The sections Removal and installation of the heat exchanger of a heater and Removal and installation of a tube of the calibrated jet).
The tube going from the calibrated jet to the evaporator should be to the touch cold, and the target hose - is a little more (on 2-6 ° C) is colder. If the exit appears more warmly than an entrance, coolant level in system is insufficient (system недозаряжена). The first of signs of an insufficient charging of system is the condition leaving of sleeves in salon of the car of air. If air not cold as it should be, system needs a charging. More detailed diagnostics of a condition of system demands use of the special equipment and lies outside the limits of qualification of the average amateur mechanic.
If the inlet tube is covered with hoarfrost, accumulator surfaces are to the touch colder, the system also needs additional charge.

System refueling by a coolant

Get in shop of automobile accessories a special set for a charging of central air of air. The ventilny valve (tap) and the short hose connected between the gate and the working valve in a low-pressure head part of system enter into a set the canister with a coolant (refrigerator oil) in volume of 12 ounces (340 g). As one canister of a coolant it can appear insufficiently for a final charging of system, it is meaningful to get pair of spare in advance. Make sure that one of canisters contains refrigerator oil of red color. In case of leaks in system the reddish shade of a coolant will help to reveal their source.

At all do not add in system more than two canisters of a coolant.

The base charging set for systems of type 134а can be got always in shops of automobile accessories - on packing surely there should be an index 134 and (not R-12), the canister from 340 g (12 ounces) refrigerator oil also should be applied.

PERFORMANCE ORDER

Following instructions enclosed to a set, collect a charging set.

Do not try to connect a hose of a charging set to the high-pressure head party of system AT ALL! It is necessary to notice that the design of the union and does not allow to make it.

Give a flywheel of the ventilny valve (tap) of a charging set and connect a set to the canister with a coolant. Track that in a carving part of the union the sealing ring was established.

At work with the canister in which the coolant is under pressure put on goggles.

Remove a boot from the charging union of a low-pressure head part of system (directly over a broad tank of system of cooling)

Add a coolant in the low-pressure head union of central air of air.

Warm up the engine and turn on the air conditioner. Try not to allow hose contact from a charging set with blades of the fan of system of cooling and other moving components in an impellent compartment. The charging of system demands rotation of its compressor. If the coupling of coupling of the compressor is periodically disconnected, disunite the electric socket of the cyclic switch on the accumulator (store) and connect a wire crossing point. It will force the compressor to work in a continuous mode.

Remove the cyclic switch from the block of the accumulator and connect its socket directly to the battery by means of a wire from a set for engine start from an auxiliary source is will allow to avoid periodic shutdown of the compressor.

Turn the handle of the valve of a set so that its core pierced a membrane of a mouth of the canister, then return the handle in initial provisions, having taken out a core from an opening and having provided pass through the last of a coolant. Hissing of passable gas thus should be heard. Add a coolant in a low-pressure head part of system in the small portions until temperatures of surfaces of the accumulator and an inlet tube of the evaporator will be made even. Before each following giving leave time for system stabilization.
In the presence of the exact thermometer it is possible to enter it into the central sleeve of the conditioner in salon of the car and constantly to trace temperature of leaving air. Regularly functioning correctly charged central air should cool air to temperature about 4,5 ° S.Esli ambient temperature (external air) is very high, for example about 44 ° With, the temperature of air leaving a sleeve can reach to 15,7 ° S.Normalnym is the ostuzheniye of external air on 17-28 ° Page.
After a devastation of the canister turn a tap in a closed position and disconnect a hose from the low-pressure head union of system. Establish into place an union boot.
Disconnect a set from the canister and store before the following filling of system. The piercing core of the valve should be involved in order to avoid an unexpected protykaniye of a crossing point of a mouth of the new canister at the next assembly of a set.