What would cause the temperature to rise if it's not the radiator
What is your question?
I replaced the radiator and after I took a trip to Montana it started to smell like something was burning and now I'm driving around town the temperature starts to rise quickly
What makes this problem better or worse?
The heater
How long has your 2000 GMC Safari had this problem?
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Coolant leak - - Thermostat malfunction - - Combustion entering cooling system (failed head gasket) - - Insufficient cooling fan operation - poor airflow into engine bay at slow speeds.
Assuming air trapped from radiator replacement has been purged from cooling system during trip.