No heat at idle and overheating

Joined
Oct 21, 2015
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Location
Knoxville,tn
I've noticed my truck doesn't have heat at idle but it does at high idle and today driving down the road coolant temp hit 235 after sitting at idle for 10 minutes in a drive through. Could my heater core be clogged causing the heat problem or is my water pump on its way out.
 

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