A6 Quattro Wagon V6-2.8L (AFC) (1995)
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Using a jumper wire, connect terminal C of thermal switch connector to ground.
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Start engine.
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Warning symbol must be displayed after approx. 30 seconds (warning chime sounds)
If NOT:
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Check wiring for open circuit according to wiring diagram, repair as necessary.
If wiring checks OK:
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Replace printed circuit board in instrument cluster.