What is the relay number for the Passat B5 compressor?
2 Answers
Passat relay is No. 100. Here is more information about the relay: 1. Concept: Relay (English name: relay) is an electrical control device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change of the input quantity (excitation quantity) reaches the specified requirements. 2. Function: It has an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). It is usually used in automatic control circuits, and it is actually an "automatic switch" that uses small current to control large current operation. Therefore, it plays a role in automatic adjustment, safety protection, circuit conversion, etc. in the circuit.
The compressor relay number for the Passat B5 is typically 100 or 109, located in the relay box in the engine compartment. For the B5 model, Volkswagen often uses a relay with a numbered label to control the air conditioning compressor circuit. After opening the fuse box cover, you can find the corresponding label. If the air conditioning suddenly stops working and the fan doesn't respond, it might be due to a faulty relay. A damaged relay can prevent the compressor from starting, leading to poor cooling performance. During inspection, first turn off the engine, remove the relay, and check for any burnt or loose contacts. It's recommended to regularly clean the relay box to avoid dust buildup and pay attention to any unusual noises from the air conditioning while driving. If experienced, you can use a multimeter to test the relay's continuity and ensure proper power supply. When replacing, choose a model that matches the original factory specifications to avoid compatibility issues. If unsure about the relay number, refer to your vehicle manual or search online forums where owners share specific diagrams.
