You presumably filled the cooling system before going for the test drive. You say there is no leaks yet there was room for more antifreeze.
If this is true the room for more antifreeze must have been created by the overheating and probably overheating was a gross understatement, boiling perhaps - or because the head gasket is failing or failed.
Severe overheating can have far reaching effects from burning away the cylinder lubrication and robbing an engine of compression to softening valve springs and piston rings. Assessing the damage caused by overheating can be a lengthy process - you might be lucky or you might not.
I suggest you begin with a compression test...
SOURCE: overheating but thermostat already replaced
http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Water+Pump&partName=Engine+Cooling&pageId=0900c1528024330d&partId=0900c152802432ef#hd1-1-1
good luck replace the thermostat also while you have the coolant out here is a link for that
http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Thermostat&partName=Engine+Cooling&pageId=0900c15280243304&partId=0900c152802432ef
SOURCE: 98 cadillac seville 4.6 overheating
are your fans or fan working if not it will get hot. I assume you have electric fans or fan if so make sure when it starts to overheat the fan or fans come on if not check the fuse for the fans or relay, breaker, wiring itself.
SOURCE: mazda mpv overheating when driving
possible head gasket do a preasure test on the coolant system to see if it loses any coolant or presure drops and check for leaks hope this helps
SOURCE: Why is my 1993 pontiac sunbird overheating? Full
IF OVERHEATING WHILE SITTING AND IDLING MORE LIKELY COOLANT FAN NOT COMING ON CHECK COOLANT FAN FUSE AND RELAY BUT IT. COULD BE FAULTY COOLANT TEMPERATURE SENSOR.LAST RESORT IF EVERYTHING CHECK OUT OKAY HOTWIRE COOLANT FAN.IF RUNS ELECTRICAL WIRE CONNECTOR HAS DAMAGE WIRES.IF FAN DONT RUN YOU HAVE TO REPLACE FAN MOTOR.
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