Journey FWD V6-3.5L (2009)
Windshield Washer Spray Nozzle: Description and Operation
Washer Nozzle - Operation
REAR
The rear washer nozzle is designed to dispense washer fluid into the wiper pattern area on the outside of the liftgate glass. Pressurized washer fluid is fed
to the nozzle from the washer reservoir by the washer pump/motor through a single hose, which is attached to a barbed nipple on the back of the nozzle.
A fluidic matrix within the nozzle causes the pressurized washer fluid to be emitted from the nozzle orifice as an oscillating stream to more effectively
cover a larger area of the glass to be cleaned.
The integral check valve in the nozzle prevents washer fluid from draining out of the washer supply hose back to the washer reservoir. This drain-back
would result in a lengthy delay after the washer switch is actuated until washer fluid was dispensed through the nozzle because the washer pump would
have to refill the washer plumbing from the reservoir to the nozzle. Such a drain-back condition could also result in water, dirt, or other outside
contaminants being siphoned into the washer system through the washer nozzle orifice. This water could subsequently freeze and plug the nozzle, while
other contaminants could interfere with proper nozzle operation and cause improper nozzle spray patterns. In addition, the check valve prevents washer
fluid from siphoning through the washer nozzle after the washer system is turned OFF.
When the washer pump pressurizes and pumps washer fluid from the reservoir through the washer plumbing, the fluid pressure unseats a diaphragm from
over a sump well within the nozzle by overriding the spring pressure applied to it by a piston. With the diaphragm unseated, washer fluid is allowed to
flow toward the nozzle orifice. When the washer pump stops operating, the spring pressure on the piston seats the diaphragm over the sump well in the
nozzle and fluid flow in either direction within the washer plumbing is prevented.
