engine gets plenty hot, about 200 deg. Blower motor works well. The heater hoses are very hot all the way up to the firewall. I assume this is the heater core? Is there anyway to flush this thing? I don't want to pull the dash, I did a few years ago, when the evaporator started to leak. Is there any flush chemicals, and compressed air would uncork this thing, if it is actually plugged up. I disconnected the A/C unit, to make sure it wasn't fighting each other.