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What could cause a rear defroster to not work in 2001 Alero if fuse or relay?

There are several reasons why a rear defroster may not be working in a 2001 Alero, even if the fuse and relay are both in good condition. Some of the possible causes include:

- Defroster grid damaged: The defroster grid is a series of thin metal lines that are embedded in the rear windshield. If the defroster grid is damaged or broken, it will not be able to generate heat and defrost the windshield.

- Defroster switch malfunction: The defroster switch is the button or switch that you use to turn on the defroster. If the defroster switch is malfunctioning, it will not be able to send power to the defroster grid.

- Wiring issues: The defroster grid, defroster switch, and relay are all connected by a series of wires. If any of these wires are loose, broken, or corroded, it will prevent the defroster from working.

- Defroster relay malfunction: The defroster relay is responsible for sending power to the defroster grid. If the defroster relay is malfunctioning, it will not be able to turn on the defroster.

- Defroster timer malfunction: Some vehicles are equipped with a defroster timer that automatically turns off the defroster after a certain period of time. If the defroster timer is malfunctioning, it may be preventing the defroster from staying on.

It is recommended that you have a qualified mechanic diagnose the problem to determine the exact cause of the defroster not working.

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