You will need to raise up the driver side wiper once the hood is opened.
On the freestar the cowl is being held on by pushpins rather than screws on the top cowl cover.
On the bottom cowl cover there are screws on the right and left, but the windshield wiper mechanism is also attached to the underside of the lower cowl panel on the drivers side, so you will need to disconnect the wiper hose and electrical connector to completely remove the cowl; leave the wiper assembly attached to the cowl.
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You can find your 1999 Ford Expedition front windshield wiper fuse in the fuse box. The windshield wiper fuse will be in the second column, fourth from the top.
The 1998 Ford Crown Victoria windshield wiper relay switch can be found on the firewall in the engine compartment. The windshield wiper relay switch will be on the passenger side of the firewall.
The cabin air filter is located directly under the passenger side windshield wiper. All that needs done is a few remove a few screws and the long filer is underneath.
There are check out charts that the mechanics have access to that will lead to the problem
Grill under the windshield