Make sure of absence of resistance to rotation крыльчатки the fan at the cold engine, in case of need replace муфту couplings.
At the hot engine resistance to rotation крыльчатки, on the contrary, should be felt, otherwise муфта also is subject to replacement.
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Make sure of absence excessive люфта the bearing, in case of need replace муфту.
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Examine муфту on presence of signs of development of leaks, make sure of absence of deformations of a bimetallic spring.
In case of need remove муфту for its more detailed studying.
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