Are you toggling it on at the very beginning of a mission, or are you waiting for one of your mechs to generate heat first, according to the instructions?
From what I've experienced, once toggled on AFTER you start to generate heat, the option appears to stay on, and your mechs will not generate additional heat, even through subsequent missions, at least during the same game play session.
Thanks, that worked, though the first scan found over 100 results, after making a small purchase and re-scanning it came down to just 5, and the edit then worked.
[Edited by moderator Taurusplopp, 4/25/2018 12:03:48 AM]
Save game location
Wherever your userdata is stored for Steam is where you'll find it, but follow the above path to get to the right game.
If installed on C: and under program files:
C:\Program Files (x86)\Steam\userdata\7929415\637090\remote\C0\SGS1