Yup, it seems to be this way. I don't know if it's a bug but with the latest beta patch (i didn't check if the final patch is out yet) it's true that radiators don't work until you start the engines.
Maybe it's a bug, or maybe the rads are hydraulically operated and they need one or both engines to be running to supply hydraulic pressure (usually in twin engined aircraft one of the engines drives the hydraulic pump, i guess this would be the engine to start first if you need hydraulics to operate the rads)
In any case, there's a lot of stuff that seems like bugs but could be legitimate and accurate features, so until we get improved documentation or manage to work it out by ourselves i'm not drawing any final conclusions.
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