Jeep Grand Cherokee

1993-1999 of release

Repair and car operation

Check of serviceability of an electric contour and replacement of components of the motor of the fan of a heater and air conditioner

Contour check

PERFORMANCE ORDER

Check all safety locks and electric sockets of a contour on reliability of fastening and existence of traces of corrosion. Make sure that the battery is completely charged.
Having transferred transmission to the situation "R" (Parking) and having cocked the parking brake, turn the ignition key in the situation ON (without starting the engine).
The fan of a heater is located under a ware box of the dashboard, near a partition of an impellent compartment. Unbend a clip on one of screws of fastening of the motor of the fan and liberate from it a plait of wires. Delay a plait down, facilitating thereby a rassoyedineniye of the electric socket.
Connect to the electric socket of the motor of the fan of a heater the voltmeter.

Disunite the electric socket of the motor of the fan of a heater and connect to attached to a plait of wires to its half the voltmeter.

Consistently switch the fan switch in all provisions, watching instrument readings. Change of fixed tension speaks about corresponding changes in speed of rotation of the fan (when switchings switch). To the minimum speed there corresponds the minimum supply voltage while at transfer of the switch to position of the highest speed a food on the fan moves bypassing the resistor and reaches the maximum value in 12 Century.
If tension is fixed, but the fan does not rotate, establish a crossing point between the plug of grounding of the motor and "good" mass of the chassis of the car. The wire equipped with a safety lock connect between the positive plug of the battery and the positive plug of a half of the socket from the motor. If now the motor starts to rotate, remove additional wires (crossing points) and if the motor at crossing point shutdown on weight immediately stops, check reliability of grounding of the motor. If after introduction of corrections the motor does not start to function, most likely it is faulty.

Connect the tire of grounding and the wire equipped with a safety lock from the positive plug of the battery directly to a half of the electric socket of the fan from the motor and check, whether the motor will turn on now.

Resistive assembly of the motor of the fan of a heater

Resistive assembly of the fan is located on a heater casing. On a payment of assembly some resistors corresponding to four speeds of rotation of the fan are established.

Location of resistive assembly of the fan of a heater.

PERFORMANCE ORDER

Remove assembly from the seat and examine it on existence of damages. Check conductivity of assembly between all its plugs. If as a result of an overheat the restrictive contour appears is broken off, it is necessary to make the corresponding replacement, establishing only identical replaceable components.

Unscrew two screws and get from the holder the resistor of the motor of the fan.

By means of the voltmeter check a contour between the switch of the fan and the resistor, measuring tension on the rezistorny end of a plait. Check each wire on each of speeds.

The motor functions only on one of speeds

PERFORMANCE ORDER

If tension on the motor is absent, disunite the electric socket of resistive assembly and check on existence of tension it. If a food is present only on socket plugs, check conductivity of resistive assembly and a wire between assembly and the motor. A wire check also on existence of signs of short circuit.
If tension on assembly is absent, remove the control panel a heater (The section Removal and installation of assembly of management by a heater and the air conditioner) and, having turned the ignition key in the situation ON, measure tension on the socket of the switch of the motor of the fan of a heater.
If tension is absent, check conducting between the assembly block of safety locks and the switch on break and short circuit.
If tension takes place, connect one end of a long wire to the zapitanny plug of the socket of the switch. The second end of a wire serially connect to each of food plugs on resistive assembly. If now the motor functions normally, replace the switch.