1994 Prizm runs hot at high speeds

My Prizm runs very hot at high speeds. No leaks, no coolant in oil, changed thermostat twice, bottom hose cool top hose hot, fans running fine, and blows out hot air from the heater. Blows coolant back into the overflow reservoir when hot. Could it be a clogged radiator or the system needs to be bled?

You said top radiator hose is hot, now does radiator itself get hot, all the way top to bottom? side to side? if not, she's all clogged up- wherever it's warm, there is flow, where it is cool, no flow- pretty simple to check- the hard thing may be being able to feel the entire surface areas. I'd replace it if it's cool- boneyard or new is your choice.