I am having problem with my heater and i cant get it to work. I replace my heater hose, radiator, all the main hoses that run to the radiator,and i replace the thermostat due to previous overheating problems,and before it the heater worked great but now it doesnt. So what can be wrong with it????

 

I would try flushing the heater core. Disconnect your heater hoses and using a garden hose, flush water back and forth through the heater core. I expect that a bunch of rusty scale will eventually come out.

 

It worked before doing all the changes? Sounds like an air pocket in the heater core. Mine did the same thing.

 

http://www.lunghd.com/Tech_Articles/...BurpAirMod.htm