What is the relay number for the Volkswagen Lavida's air conditioning?
2 Answers
Volkswagen Lavida's main relay is the 648 relay. Extended information about relays is as follows: 1. Introduction: A relay is an electrical control device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity (excitation quantity) meets the specified requirements. It establishes an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). 2. Main function: Relays are automatic switching components with isolation functions, widely used in remote control, telemetry, communication, automatic control, mechatronics, and power electronic equipment, making them one of the most important control components.
I've been driving a Volkswagen Lavida for several years. Last time when the air conditioning wasn't cooling, I went for a check and found the relay had issues. The relay is a small component that controls the air conditioning switch, usually labeled as No. 645 in Volkswagen Lavida, located in the fuse box in the engine compartment. Just open the cover and you'll see a row of small squares, each with a number label. For my 2018 model, it's No. 645, but it may vary for different years, like sometimes No. 648 for the 2015 model. I suggest checking the owner's manual first; there's a fuse and relay layout diagram at the end, which is very clear. If you don't have the manual, search online with your car model and year, or go directly to a 4S shop and let them check the VIN code to confirm. If the relay is broken, the air conditioning will stop working, making summer drives uncomfortably hot. Replacing it yourself isn't hard—just pull out the old one and plug in a new one of the same model—but if you're not familiar with circuits, don't mess around to avoid short circuits. For safety, it's more worry-free to find a professional.
