Correct. Ambient should be nearly the same as 'rad intake temp' given your design. In your rig, air temp in the shroud has been heated by the rad.
Is your setup "pump--->radiator------>block----->pump" ?
The cascade likes being 1st after the pump, being a 'jet impingement' design.
Speaking of that, your setup has like a potential case airflow problem. I assume your case fans are all set to exhaust, such that air flow will be the opposite of heat convection in the case.
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