[OverBoardProject]

On your way to the parts store where you should buy a Prestone engine flush kit, a new thermostat (with gasket) and a rad cap.
Stop in at a self serve car wash and wash your rad out as good as you can. It works best from the inside out.
And if you have air conditioning bring along the wrenches to loosen off the rad and tilt it in. Spray out i rad at a time.

When you get home follow the directions on the rad flush bottle, and then replace the rad cap and thermostat.

You might also want to add new antifreeze,
and there is some chemical that the auto parts store should have that is suposed to make the coolant a little cooler. I don't know if it works

Good Luck