My girlfriend has an 07 Charger sxt with the 3.5. the heat has never been great, back in august, the fan blew apart and busted the radiator. replaced both and the thermostat. heat finally worked right, didnt need it at the time, but it worked.
In the past 2 months the heater became iffy, some times turn the temperature back and forth would get it to work. 3 weeks ago it became just cold air. nothing was leaking, changed the thermostat again, just because it was under warranty and it would be free to try. Did not work, someone suggested bleeding it. Tried that, got lukewarm air for an evening, then it was gone. Someone else suggested a flush could help, i took it to firestone, figured their flush would be better than a diy, no change. The next suggestion was the heater core. Im really a novice mechanic, just try to help her out and save some money on labor charges. So without checking the old one, i replaced it. It got a little warmer for a couple of days, but never hot air.
The heater core gets hot, the heater hoses at the firewall both get hot, the thermostat is working, and the reservoir is full, but still no heat. I've read it could be the blend door actuators, ive taken all 4 out, opened them, nothing was broke and i put them back. How do I tell if they are bad?
Any suggestions would be great