As the tiltle says where is that sob at tires of throwing snow on my windsheild 01 XJ Sport

Inside the front drivers side fender. You will have to remove the drivers side wheel and the plastic inner fender to get at it.

You will see two pumps,

The lower one is for the front windshield. And you guessed it, the top one is for the rear.

Awesome thx guys!

The wiper arm for my rear window is missing, so coincidentally so it the hose for the rear sprayer. Now I've got a James Bond anti-spy device to help stop tailgaters.