It is in an auxiliary relay box directly beneath the air filter hose. The washer relay is th eone in the upper left hand cormer as you look down from the right fender.
There is no washer relay.
The washer fluid for the rear liftgate is supplied by the same reservoir as your windshield ( located in the engine compartment ) on a 1999 Ford Explorer
The 1999 Ford Explorer uses only one washer fluid reservoir for both front and rear washers. It's the one under the hood on the passenger side. The forward tank is for the radiator overflow, the rearward one is for washer fluid. There's only one washer motor, too. It runs forward for the front nozzles, and reverse for the rear nozzle.
The windshield washer pump on a 1999 Ford Explorer moves washing fluid from the reservoir and sprays it onto the windshield. It is capable of spraying in a constant stream or in pulses.
The washer fluid pump is on the bottom of the washer fluid reservoir.
5 w 30 , according to the 1999 Ford Explorer owners manual
yes. they are the same motor
On a 1999 Ford Explorer : In the Power Distribution Box ( which is " live " ) located in the engine compartment near the brake fluid reservoir ( the # 6 relay is the starter relay )
On a 1999 Ford Explorer : In the Power Distribution Box ( which is " live " ) located in the engine compartment near the brake fluid reservoir ( mini fuse # 10 is a 15 amp fuse for the horn relay ) * also , the # 7 relay is the horn relay
The blower motor relay for high speed would be located in the power distribution box under the hood.
According to the 1999 Ford Explorer Owner Guide ( 5W-30 ) is used in all the engines
I'm pretty sure that you can use years 1995-2001. If you go through a junkyard to get the part you can save some money and they will be able to tell you for sure which years are compatible.