Not all 91 Caprices came with rear window defrosters. You have to look in the glass in the back window to see if it has the small wires inside. The switch is usually on the right side of the climate control panel under the radio.
Some rear window defoggers are filaments built into the rear window that heat up when the rear defogger is turned on. This type of window should not be scraped with an ice scraper.
Turn on the ac if you have it.
Ervin baran
In most cases controlled by rear window defogger switch
the rear window above the defogger
The fuse for the rear defogger is located behind the glove box. Just had mine replaced.
They make kits that are sold in most autoparts stores for repairing the broken wires on the rear defogger. Pretty inexpensive.
In most cases controlled by rear window defogger switch
in the rear of the car maby?
In the center dash console, beneath the middle A/C Vents, besides the Rear Window Defogger and above the A/C Control Panel.
You can find a wiring diagram for the rear window defogger in a 1995 Ford Escort LX Haynes repair manual. The book is available at most auto parts stores.