The heater must be removed from the car before any dismantling can be carried out. If the matrix is blocked with sediment, reverse flushing or a proprietary cleanser can be used to clear it; however, if it is leaking, renewal is recommended as repairing a matrix requires skilled expertise. In the case of a faulty motor, it can be removed by drilling out the securing rivets, taking off the clamps from the heater housing, and then releasing the water valve and rubber sleeves. The motor and fan should not be separated, as they have been balanced during production, and should be renewed as an assembly if necessary.