I noticed recently that the MuckRaker GMMM-2 MiningMech from TRO:Irregulars (p125) has 0 heat sinks; I know IM with ICE engines don't generate heat from movement (TW p158), and ICE Engine crits don't generate excess heat (TW p126). But this still leaves the question of external heat sources - infernos, etc.
Water only seems to increase efficiency of heat sinks (TW p159) not offer straight cooling itself (which would be risky depending on the mech, as being submerged can destroy some IM's, TW p52, footnote 8 ).
Shutting down (TW p160) only says existing heat sinks cool a mech down and there is no minimal heat loss.
Does this mean that in a game any external heat applied to an Industrial Mech with 0 heat sinks can only be removed by hooking up / being sprayed by a coolant truck?