How to Fix Defroster in Car

Winter season can be challenging for car owners, especially when you are driving with a frosted windshield that hinders your visibility. Fortunately, most modern cars come with a defroster that helps clear the frost quickly. However, if your defroster is not working effectively, it can be frustrating and dangerous. In this article, we will guide you on how to fix defroster in car.

1. Check the Fuse

The first thing you should check is the fuse. A blown fuse can cause the defroster to stop working. You can find the fuse box under the dashboard or the hood of your car. Use the owner’s manual to locate the fuse that controls the defroster and check if it needs replacement. If the fuse looks okay, you can use a multimeter to test if it has continuity.

2. Inspect the Wiring

If the fuse is not the problem, check the wiring for any damage or loose connections. The wiring is usually located under the dashboard and connects to the defroster switch and the defroster grid. Look for any frayed or broken wires, and if you find any, replace or repair them as necessary. Also, ensure that the connections are tight and secure.

3. Test the Defroster Switch

The defroster switch may also be the culprit if it is not functioning correctly. Use a multimeter to test if there is continuity between the switch and the wiring. If there is no continuity, replace the switch with a new one. Also, check if the switch lights up when you turn it on. If it does not, replace the switch or the bulb.

4. Inspect the Defroster Grid

If the wiring and switch are working fine, the defroster grid may be the problem. The defroster grid is a series of thin wires that run across the rear windshield or the side mirrors. It generates heat that clears the frost. Inspect the grid for any damage, such as cracks or breaks. If you find any, you may need to replace the entire grid.

5. Check the Ground Connection

The defroster grid needs a ground connection to work correctly. Check if the ground connection is tight and secure. You can find the ground connection either on the windshield or the side mirror. If the ground connection is loose or corroded, clean it and tighten it. If it is damaged, replace it.

6. Use a Defroster Repair Kit

If the defroster grid has minor damage, such as small cracks or breaks, you can use a defroster repair kit to fix it. The kit contains a conductive paint that you can use to repair the damaged area. Follow the instructions on the kit carefully.

7. Replace the Defroster Grid

If the defroster grid has significant damage, such as large cracks or breaks, you may need to replace it. You can buy a replacement grid from a car parts store or a dealer. You may also need to replace the adhesive that holds the grid in place. Follow the instructions on the replacement kit carefully.

8. Clean the Defroster

Regularly cleaning the defroster can help prevent damage and prolong its lifespan. Use a soft cloth and a mild cleaner to clean the defroster grid and the windshield. Avoid using abrasive cleaners or rough materials that can scratch the grid or the windshield.

9. Test the Defroster

After fixing or replacing the defroster, test it to ensure it is working correctly. Turn on the defroster switch and wait for a few minutes to see if it clears the frost. If it does not, recheck the wiring, switch, and grid for any problems.

10. Seek Professional Help

If you cannot fix the defroster on your own or are not confident in your abilities, seek professional help. A car mechanic or an auto-electrician can diagnose the problem and fix it for you. It may cost you some money, but it is better than driving with a faulty defroster that can put yourself and others at risk.