Test sequence

2002 Volkswagen Golf GLS, 2.0 K, StandardSECTION Test sequence
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  • Remove left-hand insulation tray: β†’ 50 BODY, FRONT
  • Disconnect 3-pin connector from Coolant Fan Control (FC) Thermal switch F18.
Fig 1: Coolant Fan Control Thermal Switch 3-Pin Connector
GW00000159Courtesy of VOLKSWAGEN UNITED STATES, INC.
  • Bridge contact - 1Β  - and contact - 2Β  - of connector using adapter cables from Supplemental measuring tool set VAG 1594 A. 1st speed for Coolant fan V7 and Coolant fan V35 must start.
  • Switch ignition on.
  • Bridge contact - 2Β  - and contact - 3Β  - of connector with adapter cables from Supplemental measuring tool set VAG 1594 A. 2nd speed for Coolant fan V7 and Coolant fan V35 must start.

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

  • Locate and eliminate open circuit referring to wiring diagram: β†’ Electrical Wiring Diagrams, Troubleshooting and Component Locations

If no wiring fault is detected:

  • Replace Coolant fan V7 or Coolant fan V35.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.