Temperature warning light on models produced before July 1979.
In the Golf model produced before July 1979, with standard and L-equipment, instead of a temperature gauge there is only a red warning light warning of too high a coolant temperature. Periodic check of the incandescent lamp.
Turn on the ignition.
Remove the yellow-blue wire from the temperature sensor near the thermostat housing and press it to the ground.
Now there should be a handful of signal lights.
If the lamp does not light, you need to check the lamp and the wire along its entire length. When the ignition is on, the contact on the wire should be under voltage.
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 the 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 decreases to 0 Ω.
Temperature LEDs in models produced after August 1979.
In Golf models with standard and L-equipment manufactured from August 1979 to July 1980, two LEDs monitor the coolant temperature. At temperatures below 40 degrees Celsius, the yellow LED lights up. Overheating is indicated by a red flashing LED. When the ignition is switched on, both LEDs are functionally monitored. The yellow one lights up when the engine is cold; the red one flickers for only a few seconds.
If the LED remains dark, turn on the ignition.
Remove the yellow-red wire from the temperature switch near the thermostat housing (yellow led) or blue-yellow wire (red led) and press it to the "mass".
If the corresponding LED now lights up or flickers, then the wire and board are OK. Replace the temperature sensor.
If the LED does not light, then you need to check the wire along its entire length, the board and the diode itself.
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