Well the mystery coolant leak I still have seems to disappear in hot weather, and resumes each fall when the cool weather arrives.

I replaced the rad, rad hoses, both heater core hoses, coolant reservoir and hoses in February, but the leak is still there, only much slower. This is odd as the pressure on the entire cooling system is far greater in summer, especially with the a/c on.

I am trying to figure out why the coolant would leak in winter, but not summer so I can fix this once and for all. Don't think it is the heater core as the carpet inside is bone dry. Ideas on a find and fix appreciated.