Hot air blowing thru air vents w/o heater on - 2001 Mitsubishi Eclipse

SOURCE: heater wont blow hot air in van. How do i fix it?

add coolant to the radiator and it should help circulate it and warm the air up

SOURCE: My a/c is blowing hot air and makes noise.

try getting regassed, but poss be the pump.

SOURCE: Mitsubishi Eclipse Ac and heater problem

cold air on passenger side of car and warm on drivers, why

SOURCE: 2002 eclipse heater blows cool air

Check your antifreeze level and if low then add antifreeze until the radiator is full and the overflow tank is up to the correct level. that should solve your problem. If it isn't that, chances are your thermostat could be stuck open which isn't allowing the coolant to warm up properly.

Good Luck