Temperature warning light on models before July 1979
In the model "Golf", produced before July 1979, with conventional L-equipment, instead of the temperature gauge, there is only a red signal light warning of too high coolant temperature. Periodic control of the incandescent lamp.
Turn on the ignition.
Remove the yellow-blue wire from the temperature sensor near the thermostat housing and press it against "mass".
Now should a handful of signal light.
If the lamp does not burn, it is necessary to check the lamp and the wire along the entire length. With the ignition on, the contact on the wire must be energized.
It is also possible that the circuit in the board is open.
Using an ohmmeter, you can check whether the temperature sensor is working correctly.
Remove temperature sensor. Connect an ohmmeter. The measured value tends to infinity.
Heat the sensor to a temperature of about 100°C. The sensor contacts should close. The resistance value drops to 0 Ω.
Temperature LEDs on models manufactured after August 1979
In models "Golf" with standard and L-equipment, from August 1979 to July 1980, two LEDs monitor the temperature of the coolant. At temperatures below 40 degrees Celsius, the yellow LED is on. Overheating is indicated by a red flickering LED. When the ignition is switched on, both LEDs are functionally monitored. Yellow lights up when the engine is cold; red blinks for only a few seconds.
If the LED remains dark, turn on the ignition.
At the temperature switch near the thermostat housing, remove the yellow-red (yellow LED) or blue/yellow wire (red LED) and press to "mass".
If the corresponding LED is now on or flickering, then the wire and the board are in order. Replace temperature sensor.
If the LED is off, then you need to check the wire along the entire length, the board and the diode itself.
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