Rattling sound in engine

Did you top up the oil and see if the engine still rattles? If so, you may have damaged the engine bearings due to lack of oil. See a mechanic for an opinion. If the engine bearings are damaged, you could have and expensive repair. If the engine beariings are OK and there's still a rattle, your mechanic will have to tell you what it is. Here's a directory link for you: http://repairpal.com/toyota-repair-in-state-college-pennsylvania

Be sure the oil is full.... if not fill it and keep a miles log on it to see if you are burning or leaking oil excessively, if its full have a mechanic check it as it sounds like you "may" have either a worn Timing Chain...or a worn Water Pump, or a worn Coolant fan assembly....all the parts above are sort of reasonable to replace except for the timing chain hopefully that is not the problem.... they usually last till 200K depending on the way you drive....quick jack rabitt take offs help make the chain wear out faster. Hope this helps good luck!!!