The air passing through the rad ain't heated much, if you've got a good airflow.
On the other hand, your cooling loop will suffer from worse rad performance, for 2 reasons:
- the rad intake is now hot air from the case
- slightly less airflow due to the fan 'pushing' through
I suggest you reverse the fan to 'sucking' cold air into the case, especially if the rad is at the bottom front.
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