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AFAIK blocking the thermostat bypass is an old school thing for a different cooling circuit...
Doing it/trying it on a ZD30 might prove pretty spectacular.
I haven't seen it done but thats because cooling isn't nearly the issue with ZD30's that it is with TD42's
Maybe someone has done it and can post up...
Isn't the thread "Can I for TD42" only
Or did I miss something.
Yes the bypass ideas for the TD42 only.
I haven't tried it so I can't say one way or the other, just passing some info on, that might help ya out.