From your last post it looks like one or some of the connectors "stingers" are not set correctly and are retracting when it gets cold, or they are not torqued on at all. IF you are able to check all outside fittings and make sure the Dialectic (white center part around the copper) is flush with the inside of the connector and the stinger comes out at least 1/8th" from the end and are compression type, not crimp or screw on.