Hi: Do you mean the interior isn't heating or the engine? If the interior, make sure the coolant if full. Next, with the engine hot, running and the heater on, check to see if both heater core hoses are hot.
Let me know what you find.
December, 23, 2011 AT 4:04 AM
Had the same problem for the last three days same car 2007 charger replaced thermostate water pumped reverced flushed it with air through the oil cooler lines caught the old antifreeze in a clear pail found crousion
in the coolent pluging the system got heat after doing this