The dealership and most auto parts stores can sell you a special electrically conductive epoxy to bond the tab back on. The voltage should read 12 volts if the break is between the tabs, less if the break is outside of the tabs. My old '90 Corolla was the same way, but the AC didn't work, so I don't know if it would've worked in conjunction with AC. About: The official instructable for Popular Mechanics magazine, reporting on the DIY world since 1902. If you know how to solder and have a high-capacity soldering iron or gun, solder the tab back on. You can find more great projects at Popular Mechanics DIY Central. On trucks with the electric rear window, pressing the right hand knob turns on the heated exterior rear mirrors. How your defrosting system works. The masking tape can be used to make a new line that exactly matches the width of your old grid, if the mask in the kit is too wide or narrow. By moving the tab along the damaged line, you’ll see 12 volts on the meter until you reach the break, where the voltage will drop considerably all at once. Rear-window defrosters draw a substantial amount of current—10 to 20 amps depending on the application. A break in the grid pattern could have been caused by an impact that left a scratch or missing section in the paint. Reconnect the wire and see if you're back up and running. Both play a part in getting moisture off the inside and outside of your windows. Disconnect both wires from either side of the defroster grid and touch one end of your tester to each wire. Driver side is working, middle sliding portion and passenger portion are not. Trace the current path from the fuse, to the switch, to the timer, and on back to the window. No new parts. First, check the obvious: Is the fuse okay? Matthew Wright has been a freelance writer and editor for over 10 years and an automotive repair professional for three decades specializing in European vintage vehicles. Replace the switch with a new one. Let us make this perfectly clear: Do not try to scrape hard frost from a rear window equipped with a heater grid. It's normal for the light to be brighter in some spots, as long as it lights up. But you may need to replace the timer—which may be integrated into a larger box of electrical controls buried under the dash. It takes a few minutes to clear the snow, and by then the engine has warmed up enough to melt the frost clinging to the inside of the windshield, and has actually made inroads to the frost on the side windows. I've replaced part number 25623688, but it fried again as soon as I put the defroster on. Don’t try to bypass the timer. This is especially likely if your defroster works on part of your rear window. Power is brought indirectly from the battery to a metal tab on one side of the windshield while a tab on the other side of the glass connected to ground. Touch the grid every three inches or so to find the break. Sozzy12 FRF Addict. Z. ziyeloho New Member. If a solder connection has failed, you might see a loose, dangling wire that obviously should be connected to the grid. The second reason is simpler—the grid will overheat if it’s left on too long. If you find yourself in the car with a frosted window and a defroster that isn’t working, you'll need to address the problem immediately. If you find a break in the circuit, move the test wire back and forth until you know exactly where it stops working. Dealer easily replaced the glass and all good. Remember, the timer will turn off the current within 5 to 10 minutes, so you’ll need to keep track of the timer’s time window or you’ll be looking for current that’s not supposed to be there. 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