Sounds like a bad water pump, or belt is slipping for water pump.
Low coolant, stuck thermostat, etc.
You probably have a bad thermostat.
Low coolant, failed thermostat, partially plugged heater core...............
heater on at idle and will not blow warm air. when moving it blows the warm air from the vents. what will cause this
Although my car is not an Eclipse, I experienced the same issue. A mechanic determined that my radiator was partially blocked and recommended replacement. My heater now blows heat whether I'm stopped at a light or moving.
it could be the heater core and ac housing unit that allows hot air to be mixed with the cold air or it could just cancel out the cold due to the motion of the car
The blower resistor power module has failed. It is behind the glove box.
The central locking fuse on a Chrysler Grand Voyager is in the fuse box under the bonnet, but strangely enough it's labelled 'fuel heater'. Mine regularly blows!
If it blows warm while idling and cool as you accelerate down the road, the coolant is low and or doesn't have proper mixture for your avg. temperature.
check heater core could be cloggedCheck the engine coolant level also.*no, the heater relies on the engine for heat and when you drive the engine warms generating heat:)*
Heater core changed three years ago,I changed Thermostat Heater still blows cool air.
can you please clarify what you mean, do you mean that the front heater blows cold but the rear blows hot or do you mean that when the heating is on cold it blows hot? many thanks paul
unit could be low of refridgent,or valve for heater not closing complety There can be other problems, but these twowould be the ones i would start with.