I get no heat from my heater, it blows cold air...I have replaced the theremosta

I did drain the radiator. Also have put in Prestone Flush to attempt to clean in-case system has sludge, Have not held but touch the radiator and is not getting hot. Even I put in a New Thermostat, could this be a cause maybe it was defective???

You didn't answer my first question! .. Here's another...Does it have or did it have the original factory installed DexCool in radiator before you worked on it?

I have been running it for one day since I worked on it. Don't know if the antifreeze in it was the original. Have owned it since 2005 if that helps

Google > DexCool sludge .. I suspect restricted or blocked heater core but without **hands-on** testing.. Can't say for sure... Good luck, I hope I'm wrong.. for your sake!

ugh Oh sounds like if the core is plugged it would be very costly....Thank you for your help

Hands-on testing!... After engine reaches normal operating temperature... Are BOTH heater hoses 'HOT' enough that you can't hold on to them? .. Heater hoses that go to the heater.. Located back @ the firewall on passenger side... Will BOTH of them start to burn your hand if you attempt to grasp and hold on to them??