Jeep Cherokee 2000 Service Manual - page 250
ELECTRIC COOLING FAN
DESCRIPTION
Vehicles equipped with a 2.5L/4.0L engine and air
conditioning and 4.0L vehicles equipped with the
“max” cooling package also have an electrical cooling
fan. The fan is controlled by the cooling fan relay,
which is located in the power distribution center
(PDC) (Fig. 15). For the location of relay within the
PDC, refer to the label on PDC cover.
The electric fan on the 2.5L engine equipped vehi-
cles is considered the primary fan (low to moderate
ambient conditions) and is energized when the JTEC
receives input from the coolant temperature sensor
or the a/c system and supplies ground to the cooling
fan relay.
The cooling fan motor is protected by a 40 amp
maxi-fuse located in the PDC. The fan relay is pro-
tected by a 15 amp fuse located in the junction block.
OPERATION
Electric cooling fan 2.5L: When air conditioning
is not requested, the electric fan will not come on
unless the coolant temperature is at least 103° C
(218° F), at which time the fan will come on and
remain on until the coolant temperature drops to 99°
C (210° F) or below. When air conditioning is
requested (including defroster operation), the fan will
cycle on and off in conjunction with the A/C compres-
sor unless the coolant temperature is at least 97° C
(207° F), at which time the fan will come on and
remain on until the coolant temperature drops to 93°
C (199° F) or below. Then, the cycle fan operation
will resume. When the fan is scheduled to be on, the
powertrain control module (PCM) provides a ground
path for the fan relay. This ground is provided to the
cooling fan relay through pin C2 of PCM connector
C3. Battery voltage is then applied to the fan
through the relay. When the fan is scheduled to be
off, the PCM opens the ground path to the relay. This
will prevent the cooling fan from being energized.
Fig. 14 Electric Cooling Fan
1 – (LHD)
2 – (RHD)
3 – VISCOUS FAN SHROUD
4 – ELECTRIC FAN MODULE
5 – ISOLATOR
6 – RADIATOR
7 – LOWER CROSSMEMBER
8 – U-NUT
9 – UPPER CROSSMEMBER
7 - 8
COOLING SYSTEM
XJ
DESCRIPTION AND OPERATION (Continued)