200 Quattro Wagon L5-2226cc 2.22L SOHC Turbo (MC) (1989)
Temperature Warning Lamp/Indicator: Testing and Inspection
Engine coolant overheating warning lamp, checking
Electronic thermoswitch connections
+ voltage supply, terminal 15a
C to overheat warning lamp
R to A/C control unit
T to coolant temperature gauge
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remove connector from electronic thermoswitch
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connect contact C to ground with jumper wire
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switch ignition ON
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overheating warning lamp flashes for approximately 30 seconds
If NO
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check warning lamp OR repair break in wiring using current flow diagram
If warning lamp still does NOT flash
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replace instrument cluster printed circuit board