thank you for your reply, the level of cooling was very low , and i put myself distilled water 0.5L , but i think i don`t say in first post , the engine works perfect normal i can go 100km-1000km no problems, after i turn off engine , i must stay to cold down engine ,the water goes on red if i try to turn on again , not in walking. some guys tell me it is the dde unit , on the tester doesn`t have errors