Volvo All Engines (2010 Emissions) Fault Code: SPN 1659 FMI 7 PID: PSID 109 Engine Coolant System thermostat

Conditions for diagnostic trouble code (DTC):
1) The component is stuck in closed position

Observable symptoms
1) High engine coolant temperature (ECT)
2) Drive-abilty effected

Probable cause
1) If the thermostat is stuck in closed position the engine will not be cooled

Detailed information
1) The thermostat may have seized in closed position if the coolant temperature continued to rise at the same rate as the oil temperature

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