VW 3-Pin 6.3mm Radiator Fan Temperature Control Switch Connector – OEM 1J0973203 / 1J0 973 203
Direct OEM-specification replacement for the 3-pin wire harness connector used on radiator fan temperature control switches across Volkswagen platforms. Cross-references VW OEM part numbers 1J0973203 and 1J0 973 203. Uses the 6.3mm contact series in black nylon housing — the 6.3mm series is the standard high-current contact pitch for cooling fan switch applications on VW Group vehicles where the switch must carry the full fan motor current.
The 3-pin radiator fan temperature switch connector is located in the engine bay, on or near the radiator or coolant circuit. It is exposed to heat from the engine and coolant, road spray, and vibration. A failed connector causes the temperature switch to lose contact with the harness, resulting in the cooling fan not activating at the correct coolant temperature. This leads to engine overheating in slow traffic or at idle, and can cause coolant boiling and head gasket damage if not diagnosed promptly.
| OEM Number | Application |
|---|---|
| 1J0973203 | VW 3-pin 6.3mm radiator fan temperature switch connector (primary) |
| Pin | Function | Failure Symptom if Open |
|---|---|---|
| 1 | Fan relay control signal (from switch) | Fan not activating at temperature threshold |
| 2 | Power supply / ground | Switch inoperative |
| 3 | Second-stage fan control (high speed) | Fan only runs at low speed, overheating risk |
| Attribute | Detail |
|---|---|
| Pin Count | 3-Pin |
| Contact Series | 6.3mm pitch |
| Housing Material | Nylon, black |
| OEM Part Number | 1J0973203 |
| Applications | Radiator fan temperature switch, cooling fan control switch |
| Compatible Models | VW Golf IV (1J), Passat B5 (3B), Bora (1J), Polo (9N), Sharan (7M) |
| Terminal Included | Yes |
Q: My VW Golf is overheating at idle but the thermostat is fine — could it be the fan switch connector?
A: Yes. A corroded or open 3-pin fan temperature switch connector is a common cause of cooling fan failure on VW Golf IV and Passat B5. Inspect the connector (OEM 1J0973203) before replacing the temperature switch or fan motor.
Q: Are terminals included?
A: Yes, terminals are included with all variants.
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3 Pin Connectors
