Heater blower works in all speeds but very little air coming out of floor heater and defroster. Dash vents have good air flow but air is not warm.
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
SOURCE: heater blows cold air
the heator core has gone out this is a divise that uses hot coolent from the engine to heat the air that blowes tru your vents it is located behind the glove box some times it's tricky to reach look under the hood to find 2 hoses running side by side in to the fire wall on the passenger side to pin point the location
SOURCE: 2003 Galant heater just stopped
There is an electric motor that turns heater core on and off. It's located under the dash to the left of the glove box. Some dis-assembly required. The part will cost about $120 to $180. part number is #MR958603. I saved money by purchasing it on line. It is a stocking part at most Mitsubishi dealers. Once you pull the glove box out and remove the bottom half of the dash all the way across, you should be able to gain access to the motor to replace it. Caution: if you do not put everything back in correctly and tie/tape it all back down carefully in the correct places you will have lots of under the dash noises when you are done.
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