190E 2.3 (201.028) L4-2.3L (102.985) (1987)
Thermostat: Service and Repair
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Drain Coolant.
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Unscrew cap (31) with connected engine coolant hose,
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Tightening torque for light alloy cap: 10 Nm (7.4 ft lbs)
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Tightening torque for plastic cap: 8 Nm (6.3 ft lbs).
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Remove engine coolant thermostat (30).
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Assemble in reverse order.
NOTES:
Install the engine coolant thermostat so that the ball valve is at the highest point.
Always replace thermostat O-ring (32).
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Check for leaks.