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What is the three-wire principle of the Jetta radiator thermoswitch?

1 Answers

DiSilas

07/29/25 4:44pm

Jetta radiator thermoswitch three-wire principle is as follows: 1. Line 1 is the positive power supply wiring, which is directly powered by the battery through the No. 1 30A fuse in the fuse box, bypassing the ignition switch. 2. When the temperature reaches 85 degrees, the low-speed terminal No. 2 plug is connected, and when it reaches 93 degrees, the high-speed terminal No. 3 plug is connected, so the thermoswitch does not have a ground wire. 3. The radiator active fan also has three wires: one ground wire, and the other two are the low-speed coil wire and the high-speed coil wire, connected to the No. 2 and No. 3 plugs of the thermoswitch respectively. The function of the thermoswitch on the radiator: 1. The thermoswitch on the radiator is used to control the radiator fan. 2. When the water temperature reaches a certain level, the thermoswitch will control the relay of the radiator fan to close.

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