There is a repair kit available to repair the grid. A test light will find the break in the grid.
My CHI hairdryer stopped working. Who can repair them?
Check that the wire on the rear defroster is connected to the defroster. If broken off repair it.
no it is not that expensive to repair
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Figure out why they stopped working and repair the problem.
You Buy A New One
Then you must repair them. Advice as to repair needs further information but check fuses and bulbs.
Check fuses
2004 ford expedition front blower not working
The lines (grid) on the rear windshield are scratched or cut. You can use a repair kit from the auto parts store or some silver solder to repair the breaks in the grid.
Someone has manufactured a tool that reams out spa fittings. You may have rust from your heater blocking the orifice.
my Chevy blazer power seat on my 1996 Chevy blazer isn't working