2001 town & country blows cold air with heat option is on. no overheating, all fluids at correct level, blows luke warm air when at higher speeds.(sometimes) The overflow and main are both clean, not rusty or dirty.
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If the coolant level (antifreeze) level is low there may not be enough fluid in the system for the temperature sensor to register a proper reading ( think of it as holding an oral thermometer just outside of your mouth).
Insufficient fluid passing through the heater core (small fan that blows through a small heated radiator) may not be enough to produce heat.
However: At increased speeds the engine may be heating what little fluid there is to a point to supply heat to the heater core, and register on the temperature sensor.