I have a 03 grand am 6cyclinder it over heated had to put water in to get home. Changed thermostat ran good for a day started to leak coolant out ofthe over flow hose now car wont start. Please help

This is very unfortunate,i have would suggested, you should have replaced your water pump too.You may have damage to your engine now.If car turns over but wont start,look at your oil to see if there is antifreeze/water in it.

Oil looks normal

If there is or not could still be on the exhuast side,damage to head gasket,and possibly head damage all so.

It ran normal for a little bit til coolant was leaking from over flow

you may want to do a compression check to see if this is your problem

Blow back is a sign of this

Doesnt it need to be running to do a compression test

No,it can be tested without running.

You may have to take it to a mechanic,he can fill it with air, to test,if the cylynender holds it its good,if it dont,its bad

Thanks for your help