Good evening together, I’m currently facing an enigmatic problem on my SQ5 and I’m rather perplexed. I’ve already tried different approaches without finding a solution to the problem. I’m from the specialist myself and hope for a helpful tip here…. So far I’ve done the following work on the vehicle: – Exchange of all temperature sensors in the cooling system, including the sensors in front of the cooler, on the exhaust gas recirculation valve (AGR) and the temperature sensor or at the driver’s side at the front of the engine block. – Renewal of the water pump and thermostat including the oil filter housing. (The thermostat is additionally electrically controlled by a heating element.) – Replacement of the thermostat at the gearbox. – Replacement of the known control valve located at the top of the V of the engine below the AGR and the oil cooler. The problem occurs when the vehicle has reached operating temperature. r after about 2-3 minutes to 75 degrees. However, as soon as I reduce the speed and drive at about 100 km/h, the temperature rises again to the normal value of 90 degrees. Does any of you have an idea what might be the cause or a suggestion for a possible defect? Thank you in advance and best regards Jannik