2002 Pontiac Grand Am running hot

If the check engine light is on, have the computer scanned to determine where the problem is coming from. Most parts stores will do it for free.

As far as the overheatong, if it happens at any speed, I would start with the thermostat, unless there is white smoke coming from the exhaust or coolant mixing with the engine oil.

Let me know if you have other questions.
Joe