Examination
Disconnect the plug from the spool (arrow right, bottom).
Connect a test lamp to the plug contact (12V/2W).
Start the engine.
The lamp should light up. Otherwise, check the wiring. Stop the engine. Switch off the ignition.
Connect an ohmmeter to the contacts of the spool. The resistance should be 40-75 ohms. Otherwise, replace the spool.
Insert plug.
Replacement
Pull out the plug
Loosen and remove hoses.
Unscrew the two fastening screws and remove the spool.
Through the opening of the spool, you can see the rotary pusher. In the cold state, it should have a gap, in the hot state it is tightly closed. To heat the spool, connect it with additional wires to the poles of the battery according to the diagram.
Install and secure the spool.
Put on the hoses.
Connect plug.
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