Send your logs to your tuner. I don't see how the radiator could be causing any of this. It could be that the idle is too low, but see what RT has to say.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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