Question about 2000 Ford Taurus

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My rear defrost will not work but the light works, whats the problem

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Visually inspect the heating grid attached to the inside of the rear window for breaks in the horizontal lines. Any break in the filaments in the grid will cause a partial failure of the defroster, leaving a portion of the window fogged or obscured.

  • 2 Use a test light or voltmeter to detect breaks in the filaments that aren't visible to the ***** eye. Touch one lead of the light or voltmeter to a grounded metal part of the car and the other lead to a spot on the heating grid. If the light doesn't light or the voltmeter doesn't register a reading, that indicates a break in the filament.
  • 3 Place a piece of tape on each side of the break. Align one piece just above the filament, the other piece just below it, leaving a thin space through which the filament passes.
  • 4 Apply the filament repair liquid with its applicator onto each break you've identified. Be sure to thoroughly cover the broken spot. Allow the repair to fully cure per the instructions on the bottle, then carefully remove the pieces of tape so they don't rip the filament repair.
  • 5 Inspect the the vertical lines on the heating grid if you've discovered that the entire heating grid fails to work. Any break in the vertical lines will cause complete grid failure. These can be can be repaired in the same way as the horizontal lines. Check to ensure that the metal power tabs on each side of the grid are securely fastened to the vertical lines, as a break here will also prevent the entire grid from heating.
  • 6 Reattach the metal power tabs to the heating grid as needed by removing the tab from its connector and repairing it using the epoxy found in the heating tab repair kit. Be sure to allow the full curing time indicated on the kit before reinserting the tab into the connector to ensure that the circuit isn't broken.
  • 7 Check the power switch and wiring to the rear window defogger if there are no breaks in the heating grid and both of the metal power tabs are securely connected to the grid. Replace the switch and/or wiring as necessary.
  • Posted on Oct 16, 2011


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    Posted on Jan 02, 2017



    • 46 Answers

    SOURCE: Rear defrost is not working

    Take your vehicle to the garage who would inspect the car circuit.

    Posted on Jan 07, 2009


    • 41 Answers

    SOURCE: Rear defroster doesn't work.

    rear defrosters are an apllied film of semi metalic strips and if you get you windows tinted often the tint man accidentally nicks these strips cuasing the defroster to malfuction check for breaks in the srips

    Posted on Dec 14, 2009

    Paul Blanchard

    • 255 Answers

    SOURCE: Rear defrost stopped working. All contacts are on

    The strips that are attached to the glass that run horizontally always suffer from the age old problem of corrosion. The best way to tell if it is these strips that is causing the problem is to hook up an ohm meter (x10 setting) and check for continuity. If this is good, the relay that feeds the defroster is probably bad or disconnected. This is located under the dash by the fuse box. Check to see if it clicks, and further check to see if you actually get 12v at the contacts back at the back glass. (12-50v setting). If you get 12v and the strips check infinite ohms, problem is, of course, the strips. Best fix is a new glass, but there are kits available that might be able to fix it (various results). Good luck.

    Posted on Jan 15, 2010



    • 149 Answers

    SOURCE: rear defroster not working. Defroster light will

    Check the defoster fuse on your fuse panel. It is probably blown.

    Posted on Dec 02, 2010

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