- The valve has to open completely at a temperature of cooling liquid of 20 °C and be closed at its increase to 70 °C.
- For valve check on the cold engine remove a box of the valve and blow in it: air has to pass. If is not present, then the valve is faulty.
- For valve check on the heated-up engine start the engine and leave it to work, idling press a hose between the valve and a collector. Turns of the engine should not change at the same time. Change of frequency of rotation of a bent shaft indicates jamming of the managing director of a plunger and need of replacement of the valve.
- For replacement of the valve merge cooling liquid, disconnect hoses of the cooling system and remove the valve.
- At installation of the new valve replace sealing laying.
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