Thats definitely not going to help. If the engine never gets up to temperature its never going to evaporate all the moisture and its probably getting fairly unhappy inside.
The transmission cooler is integrated with the engine coolant so that isn't getting to temperature either.
Blocking the rad may help I guess. Venting the PCV to atmosphere is likely to result in it getting blocked with ice at -18 so probably not a good idea. A catch can isn't going to help either if the problem is the thermostat.
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