2E3 carburetor and Mono-Jetronic system
To improve the dynamic properties during engine warm-up, an electric heater is installed in the intake manifold. The heater heats up in a matter of seconds and gives off its heat to the fuel-air mixture. The heater consists of the actual heating element (hedgehog) and a thermal switch located at the coolant pipe on the cylinder head, see below. Prerequisite for testing: the engine must be cold (ambient air temperature)
Disconnect the heater plug connector. To do this, press the metal clamp with a screwdriver and pull out the plug. Connect an ohmmeter to the heater wire and ground. The resistance of the heating element should be 0.25-0.50 Ohm, otherwise replace the heating element.
Checking the thermal switch
The thermal switch is located near the coolant pipe on the cylinder head and has red insulation.
[The information is posted on this website: VWmanual.ru]
Connect the ohmmeter to the switch contacts. The prescribed resistance value: at temperatures below +55°C — approximately 0 Ohm; at temperatures above +65°C — ∞ Ohm.
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