How to fix no water flow through block. Top radiator hose hot. Bottom hose cold, loss of power

Thank you for your suggestion. I changed thermostat but now white smoke coming out of tail pipe. Please help me my grandson and I have been broke down for 2 days.

That's not a good sign! .. Unfortunately that is a telltale symptom of a failed head gasket .. In fact, all the symptoms you have posted are indicative of a failed head gasket! .. It is no longer a DIY situation, seek qualified hands-on help.... Sorry.

Thank you for all your help.