The hoses come out of the engine, if they have no heat, the interior won't either. If the thermostat was replaced for a no heat condition its best to make sure these hoses are getting hot, the water pump may not be circulating any hot coolant. Bring it back. The core inside, the control door, there's more to the climate control, it may be this, ok? With 180,000 it may be the engine letting air enter the system also, after replacing the thermostat, testing for heat is the first step, checking the heater hoses and controls is next.
Sunday, January 3rd, 2010 AT 9:03 PM