This form of heater was not chosen by chance. It allows you to keep the small size, but increase the heating area. The intake manifold heater operates until the coolant reaches a temperature of approximately 65°C, and then turns off. The temperature switch, referred to in the wiring diagrams as coolant temperature sender G62, reports the coolant temperature to the fuel injection control unit. Depending on the coolant temperature, the control unit supplies power to the intake manifold heater via a relay on the additional relay box under the instrument panel. As the coolant temperature rises, the intake manifold is heated by the coolant circulating through the outlet channel in the intake manifold.
Intake manifold heater - check
1. Disconnect the plug of the heater power cable. The engine must be cold.
2. Connect one ohmmeter lead to the heater power lead and the other lead to «mass» (-). The ohmmeter should show 0.25-0.50 ohms. It means that «hedgehog» fine. If an ohmmeter was not at hand to check the heater, then the heater can be checked as follows.
3. Remove the fuel injection unit. The engine must be cold.
4. Turn on the ignition and make sure that «hedgehog» warms up. If the resistance of the heater is normal, but it does not work, then the reason for this may be a relay malfunction.
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