Hi friends, My son stranded today on the german motorhighway white cloud, cap off the reservoir and 2 liters of cooling water away. Reservoir empty.Error code P0115. After filling at the radiator, he ran again. But the cooling temperature is 10 km at 100 km / h back to 129 degrees. at home the emty reservoir was full again.Could save us with the air conditioning on warm home. Anyone have an idea where to look. Charger runs at 0.5 bar, no noise on the engine, new oil and oil level ok. on the way back, everthing looks right for the first 10 Km with 100km/h then suddenly hill up temp goes up again over 115 degress.no downcooling again, only with aircon on in warm step5 to 105 degrees.