Rear

Fig.3 Rear Washer Nozzle:

REAR WASHER NOZZLE
The rear washer nozzle is a fluidic type unit that includes an integral check valve. The nozzle is constructed of molded plastic and has a rubber seal and integral snap features on the back of it. The nozzle is secured by a snap fit in a dedicated mounting hole in the liftgate outer panel above the liftgate flip-up glass. Within the rear nozzle body, a small check ball is held against an integral valve seat at the inlet end of the nozzle by a small coiled spring. The rear washer nozzle and check valve unit cannot be adjusted or repaired. If faulty or damaged, the entire nozzle and check valve unit must be replaced.

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 rear washer pump/motor through a single hose, which is attached to a barbed nipple on the back of the rear washer nozzle. The rear washer nozzle incorporates a fluidic design, which causes the nozzle to emit the pressurized washer fluid as an oscillating stream to more effectively cover a larger area of the glass area to be cleaned. The integral rear nozzle check valve prevents washer fluid from draining out of the rear washer supply hoses back to the washer reservoir. This drain-back would result in a lengthy delay from when the rear washer switch is actuated until washer fluid was dispensed through the rear washer nozzle, because the rear washer pump would have to refill the rear washer plumbing from the reservoir to the nozzle. The check valve also prevents washer fluid from siphoning through the rear washer nozzle after the rear washer system is turned OFF. When the rear washer pump pressurizes and pumps washer fluid from the reservoir through the rear washer plumbing, the fluid pressure overrides the spring pressure applied to the check ball within the valve and unseats the check ball, allowing washer fluid to flow to the rear washer nozzle. When the rear washer pump stops operating, spring pressure seats the check ball in the valve and fluid flow in either direction within the rear washer plumbing is prevented.