What are the lines on the rear windshield?

1 Answers
DiWilliam
07/24/25 4:36pm
These lines are actually resistance wires. When the rear windshield fogs up or frosts, they generate heat to disperse the fog and frost, ensuring clear rear visibility. The resistance wires on the rear windshield should be used in conjunction with the defrost button. During car washing or maintenance, care should be taken to avoid scratches that could cause damage. Detailed introduction to resistance wires: The lines on the rear windshield of a car are called heating wires. They are primarily used on rainy or snowy days when the temperature difference between the inside and outside of the car causes the glass to fog up or frost. Heating the glass can solve the fogging and frosting issues. When using the heating wires, avoid prolonged use; each session should not exceed 5 minutes. Extended use can overload the glass, making it prone to cracking. Defrost buttons: There are two defrost buttons in a car: one for the front windshield and one for the rear windshield. First, the front windshield defrost. This button is marked with a fan shape featuring three upward-curved wavy lines. Some models may include the English word FRONT. Second, the rear windshield defrost. This button is marked with a rectangle featuring three upward-curved wavy lines. Some models may include the English word REAR. Additionally, many models combine the rearview mirror heating function with the rear windshield defrost button. In other words, pressing the rear windshield defrost button will also heat the rearview mirrors.
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