Will a clogged catalytic converter make the vehicle run hot

What is your question?

My 2002 Ram 1500 v6 runs hotter than normal..it has only overheated once. New water pump, and thermostat did not help. I can see No coolant loss and both the upper and lower radiator hoses are hot. There is no rough idle or misfires. The Check eng light for catalytic converter came on for about a week then went off( low threshold). The fan turns with the belts so I don't think that's it. I'm replacing the radiator this week because it overheated as I was driving about 75mph and ruined it. I've heard maybe a blown head gasket but there is no mixture in the oil. One other note is it gets worse sitting in traffic. Any other ideas would be helpful. Thanks.

What makes this problem better or worse?

Its worse in the summer

How long has your 2002 Dodge Ram 1500 had this problem?

Started at the end of last summer right before it got cold