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Home >> Audi >> 1989 >> 200 Base, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel - Standard >> Testing >> Coolant Temp Gauge Test

Coolant Temp Gauge Test

  1. Release 4-terminal connector from temperature gauge sending unit (located on cylinder head coolant flange). Connect Tester (VW 1301) between Brown/Black lead and ground. Turn ignition switch to "ON" position. Set dial of tester to following numbers and check gauge readings.
  2. With dial set at 660, gauge should read cold (between 2 dots). With dial set at 50, gauge should read hot (between 2 dots). Keep tester connected for a minimum of 2 minutes to allow gauge needle to reach checking points. If not within specifications, check voltage supply and voltage stabilizer. If voltage is found within specifications, replace gauge.
  3. To check voltage supply, release connector from temperature gauge sending unit. Attach voltmeter between Black/Blue lead and ground. Turn ignition switch to "ON" position. Voltmeter should read approximately 10 volts. If not, pull instrument cluster out and check for voltage at 26-pin connector.
  4. Attach jumper wire between Blue/Yellow lead of temperature gauge sending unit and ground. Turn ignition on. Overheating warning lamp should flash for 30 seconds. If not, check warning lamp, voltage source circuit according to wiring diagram. See appropriate chassis wiring diagram in WIRING DIAGRAMS. If still does not work, replace instrument cluster printed circuit board.
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