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Opel Astra G - Trouble with valv to heater matrix - Hulta

The heating to the car sometimes does not work.

It comes a ticking noise about 5 times per second, when I turn on the ignition.

The sound remains when the engine runs, and stop first when ingnition is turnd off.

Some days ago noise disappered, and so the heating.

Today the sound come back, and also the heating in the car.

What can I do about this?