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| Detach coolant hose from connection fitting -2-. |
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| Unscrew bolts -1- and take off connection fitting -2- together with O-ring -3- and thermostat -4-. |
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| Turn coolant regulator 1/4 turn (90°) and detach from connection fitting. |
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| Clean sealing surface for O-ring. |
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| Replace O-ring and moisten with coolant. |
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| Insert coolant thermostat into the connection fitting and turn 1/4 turn (90°) to the right. Check: The clamp of the coolant thermostat must be positioned virtually vertical. |
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| Tighten screws -1- to 15 Nm. |
Testing coolant thermostat |
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| Heat up regulator in a water bath. |
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