Thermo Control Valve Failure
ModerateCooling SystemSK Foresters can trigger multiple dashboard warning lights and poor cabin heater output when the thermo control valve sticks or fails internally. Warning-lamp and electrical faults are a commonly recorded MOT area on this model.
Engine management warning, Poor heater performance, Cooling fan running unexpectedly
- Make sure the heater gets hot quickly
- Scan for stored cooling-system faults
- Ask whether the valve has already been replaced