Coolant fan, checking

WARNING: This page is about a different car, the 2004 Volkswagen R32. However, it is still accessible from the selected car via links, so may be relevant.

Special tools, testers and auxiliary items required

Fig 1: Connector Test Set V.A.G 1594C

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connector test set V.A.G 1594C
Wiring diagram

Test conditions

Fig 2: Locating Coolant Fan Control Thermal Switch

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Main fuses must be OK.
Coolant Fan Control (FC) Thermal Switch F18 OK

Test sequence

Disconnect 3-pin connector from coolant fan control (FC) thermal switch F18.

Fig 3: Coolant Fan Control Thermal Switch 3-Pin Connector

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Bridge terminal - 1 - and terminal - 2 - of the connector using adapter wires from connector test set V.A.G 1594C. Stage 1 of Coolant Fan V7 and Right Coolant Fan V35 must start running.
Switch ignition on.
Bridge terminal - 2 - and terminal - 3 - of connector using adapter wires from connector test set V.A.G 1594C. The Coolant Fan V7 and Right Coolant Fan V35 must start running.

If 1st or 2nd speeds of fans do not run:

Determine and eliminate open circuit according to electrical schematics: Refer to Electrical Wiring Diagrams, Troubleshooting and Component Locations

If no fault is detected in the wiring:

Replace Coolant Fan V7 or Right Coolant Fan V35.