Grand Cherokee 4WD V8-4.7L VIN N (2000)
Windshield Washer Pump: Description and Operation
A single washer fluid reservoir is used for both the windshield and rear washer systems. The washer fluid reservoir is concealed behind the inner fender
liner ahead of the left front wheel. The reservoir is secured to the inner fender shield, between the inner and outer fender panels. The washer reservoir
filler neck extends upward through a hole in the left front wheelhouse extension into the engine compartment. The washer fluid reservoir has a snap-fit
filler cap with a rubber seal. The cap hinges on and is secured to a molded-in hook formation on the rear of the reservoir filler neck. The reservoir also
has a provision for a washer fluid level sensor on the forward facing side of the reservoir body.
Each of the two washer pump and motor units has a permanently lubricated and sealed motor coupled to a rotor-type pump. The two washer pump and
motor units have a barbed nipple on the inlet side of the pump, which is installed through a rubber grommet seal inserted in a hole near the bottom of the
outboard side of the washer reservoir. A smaller barbed nipple on the outlet side of the pump is connected to the washer hose.
Both the washer reservoir and the washer pump and motor units cannot be repaired. If they are faulty or damaged, they must be replaced. The washer
reservoir, the grommet seals, the filler cap and the two washer pump and motor units are all available for service replacement.
Washer fluid is gravity-fed from the washer reservoir to the washer pump inlet. One brush of the washer pump motor is grounded at all times. When the
washer switch is actuated, battery current is provided to the other brush, energizing the washer pump motor. When the washer pump motor is energized,
it spins the pump rotor which pressurizes the washer fluid and forces it out the pump outlet nipple and through the washer plumbing to the washer
nozzle(s).
