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that happened to me the heater core went out ive read alot of different things about 03 galants most of them have the same problem it started with a grinding noise turning the temp contol, its actually the heater control motor value it causes the heater core to go out
There is probably some kind of damper that opens and closes under the dash that allows the air from the blower to be blow across the heater core under the dash. Sometimes these are controlled electronically or by vacuum tubes. Look underneath the dash and look for small vacuum hoses that might be dangling loose or possible little wire cables that might have come off the sides. Possibly check Haynes Manuals (www.haynes.com) to learn how to change a Heater Control Valve.
may have air trapped in your heater core or even just your thermostat is stuck open causing the engine to run cold replace thermostat and burp air out of heater core
the clamp is definitely not tight... tighten it first and see if there is a change in heat also refill what you lost in antifreeze also see it the hose itself is not leaking if so replace both to be sure and possible flush the heater core while your at that point .
coolant has to get to heater core under dash .check for low coolant level and or bad thermostat.blower forces air over heater core to inside of vehicle.alsao check for faulty control switch
There ia an actuator that controls the flap to change from hot to cold. You have to pull the bottom part of the dash and the whole blower motor housing. The part you are looking for is located just behind the radio and has an arm that goes into the heater core line. That is the piece you need. Its around $165 dollars and a dealer only part. And hope you have someone that can do it because mitsubishi charges over $500 in labor.
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