Heater core is on the passenger side behind the glove box, this is also the location of the air conditioner evaporator core.. they should be in the same housing.
the heater core is bad
It is inside the passenger side of the dash.
Inside the dash, in the HVAC housing. The entire dash has to be removed to access.
In the middle of the heater box under the dash.
Probably the evaporator core has mould on it and needs to be cleaned.
From the Dodge forums. Drain the coolant, disconnect the surge tank to heater pipe line, and the heater core to heater pipe line, remove the drivers side engine mount, and the starter, and unbolt the heater pipe from the engine-transmission bolt. Remove the clamp from the short hose at the thermostat housing, and pull the pipe out.
it's right behind the front bumper. in front of the engine. there is no radiator cap on it. only the heater core is on the radiator.
mercury villager heater core 2001
You have to remove the dash and HVAC housing.
Haynes repair manual, Dodge Neon 2000 thru 2003. Book #30036
Replacing heater core on a 2001 chevy,cavaliar.
In the middle of the heater box under the dashIn the middle of the heater box under the dash