Window wiper fluid on my 1990 crown vic won't squirt fluid out

Use vinegar to unfreeze

Sometimes disconnecting the battery does more damage then you want it might have trip a fuse or relay check those if thats not it, maybe wiper motor or transmission went out.

Test the switch with an ohmmeter for shorts and opens.

Check the pump. it is located under the wiper fluid container. Thats where I would start. are you interested in selling it? I'm looking for a black 96 with low miles...

DISCONNECT WIPER SWITCH IF WIPERS STOP REPLACE SWITCH.IF WIPERS DONT STOP. YOU HAVE A DEFECTIVE LIMIT SWITCH IN MOTOR.

Looks like the wiper motor uses G102 as the grounding point, should be close to the fuse box in the engine compartment. If you lift it and it stops then you may have a bad switch in the motor.

it's likely the tiny motor/pump located at the bottom of the tank that has failed. to confirm this have some turn on the washer fluid switch and test for voltage at the pump. there are several aftermarket pumps you can use as a replacement.

need more info it could be fuel pump as well as the transmission make sure trans. fluid is on the right level

I replaced the same part on a 1994 Crown Vic. There are a few bolts which go through rubber mounts on the firewall and that is how the wiper motor fits against the firewall. There is a clip on the wiper drive that must be pressed and slid off the wiper shaft. The hardest part was getting clearence between the engine and wiper motor. If I remember there was a way to turn the wiper case to clear the engine. I have asked myself why this was engineered like this? There is nothing important in the way that 3/4" of clearance could have been given for removal.

While you were filling the tank you may have disconnected the pump wires. If you can hear the pump activating when you use the switch then the pump may have gotten clogged , check for sediment in the tank.  For the person with the mustang - if its only coming out of one side then its a nozzle clogged or a pinched hose.