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The driver's airbag is installed in the steering wheel hub.
We remove the driver's airbag when removing the steering wheel, also when the airbag is deployed.
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We remove the steering column switches for replacement, as well as when removing the steering column and instrument panel.
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Checking and topping up the coolant should be done on a cold engine.
It is necessary to add coolant of the same brand as it was filled in.