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Coolant Temperature Gauge Test

  1. Disconnect 4-wire connector from electronic thermoswitch, located on coolant pipe behind cylinder head. Connect Gauge Tester (VW 1301) between terminal "T" of electronic thermoswitch connector and engine ground. See Fig 1 .
  2. Set gauge tester dial to 560. Turn ignition on. Note 2 dots, one on each side of cold mark on gauge. If fuel gauge needle falls within these 2 dots, go to next step. If fuel gauge needle does not fall within these 2 dots, go to step 5).
  3. Set gauge tester dial to 58. Note 2 dots, one on each side of mark that is just past halfway mark on gauge. If fuel gauge needle falls within these 2 dots, gauge is okay. If fuel gauge needle does not fall within these 2 dots, go to next step.
  4. Check wiring. If wiring is okay, check voltage regulator. If voltage regulator is okay, replace coolant temperature gauge.
Fig 1: Identifying Electronic Thermoswitch Connector Terminals
G93F82235Courtesy of AUDI OF AMERICA, INC.
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