COOLANT LINE QUICK DISCONNECTS LEAK IN LOW TEMPERATURES AT OR BELOW -15Ë?C (5Ë?F): The coolant reservoir in the high or low temperature cooling system is low There may be a coolant leak under the vehicle There may be a check control message (ID166) to top up coolant The low temperature cooling system have a low level warning indicator. One or more faults may be stored related to the low temp cooling system: DME - 20A201 - charge air cooling system: Coolant pump protective function due to dry running active DME - 20A209 - charge air cooling system: Coolant pump protective function due to dry running active IHKA - 80120A - Compressor: Switch off due to excess pressure in the refrigerant circuit The outside temperature at the time of the complaint is at or below -15Ë? C (5Ë? F) The O-rings that seal the quick disconnect coolant lines will not seal properly when outside temperatures are at or below -15Ë? C (5Ë? F).