Question about 2003 Mitsubishi Galant

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Heater not dispersing hot air

I have a '03 Galant ES and my heater just went out. I'm not sure what the problem is, the fans work but it only disperses cold air. It was making this funny clanking noise whenever I would switch it from hot to cold or vise versa. Now it doesn't make that noice anymore, but my heat doesn't work. I checked my coolant and I'm topped off, and I'm not running hot or overheating so I don't think it's my thermastat. I also don't have a puddle of water on my floorboard so I don't think it's the heater core. I'm thinking it could be stuck on A/C. Any ideas??

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  • VR698 Sep 11, 2008


  • appeljason Sep 16, 2008

    Same exact problem. Same exact description. 2003 Galant EZ. Help - Winter is coming???

  • Anonymous Sep 18, 2008

    same here. LS model.

  • guoqiandli Sep 18, 2008

    exact same here. LS model.

  • Anonymous Sep 22, 2008

    mine has the exact same problem. started doing the same thing and now no heat

  • Anonymous Oct 05, 2008

    I have the same problem..However my car just started overheating. I changed the thermostat and that fixed the over heating but still not hot air. Try checking fuses.

  • Anonymous Oct 07, 2008

    Last year I tried to put my heater on and it didnt work. After a very bitter cold day then a warm day the heater suddenly worked!! I figured it was clogged or stuck. Now this year 2008, I turned it to the heat and it worked fine. Then on a warm day I turned it to A/C then tried to turn it to heat a few days later and no heat!!! Now Im annoyed because I know it doesnt seem to be a major problem but probably a clog somewhere. I dont want to take it anywhere and get ripped off!! I guess I will be freezing for a bit this year.

  • Anonymous Oct 08, 2008

    Same problem ES model...Everywhere I took it they said its your heater control valve thats jammed. On most other makes its located in the engine compartment...but not us, its in the DASH. Trying to remove dash and fix myself because I got quoted nothing less than 800.00

  • Anonymous Oct 09, 2008

    I have exactly the same problem

  • mattascher Oct 10, 2008

    i have the same issue, but is there any place to get this part cheaper???

  • verycold Oct 18, 2008

    yes clunk clunk clunk when changing heater controll knob...then one day no more klunk and no more heat....this appears to be a wide spread fault in this model. Really do not relish the repair bill of $500 plus. One word of caution to all...was quoted huge numbers for new heater core, thermostat, even head gasket replacement by some before I realised what the prblem was.

  • Galant owner Oct 24, 2008

    Same Problem on a 02 Galant ES. Was misquoted for a heater core. It is the Actuator that switches back and forth between cold and hot. Parts should cost around $120 on the internet. Labor is 2-3 hours. Hope I was helpful. Good luck!

  • tara0413 Oct 28, 2008

    My 2003 Galant will not put out any hot air. We changed the thermostate and checked all the fuses and nothing. I dont want to go spend a **** load of money and my dad won't listen to me about the actuator, Any other suggestions or is my dad stuburn?

  • Anonymous Nov 17, 2008

    I have the same problem with my 2003 galant. I just left the mitsubishi dealership and had a diagnostic done on it; I was told it was the heater control actuator.

  • Anonymous Nov 30, 2008

    I have same problem with 2002 galant. I went to one guy and he said heater core. But I found it strange that when I went to the 2nd guy and told him what I was told and he said yes with a higher price. 800,00 OK I think maybe it is the heater ciontrol actuator since there is no leak or smell of antifreeze. Also theuy claim that "a small part:" under the hood was cracked which is causing blockage. I think they are trying to rip me off. Of course I am a woman who knows a little abt cars but I cant look under the hood.

  • Anonymous Dec 03, 2008

    I have the same problem. A clicking noise occurred for a few months when I would adjust the cold/heat and now it's stuck on cold. I guess Mitsubishi doesn't really care about its customers after the sale because this problem is rampant.

  • chrisammons7 Dec 12, 2008

    i have the exact same problem and it is starting to get cold and it is only going to get colder. does anyone know the website where i can order the part to fix this problem?

  • chrisammons7 Dec 12, 2008

    my 03 ES has the same problem it just started maybe three or four days ago. does anyone know the website that i can order the actuator from?

  • st727 Dec 14, 2008

    I've been hearing the "noise" for a while. Kind of a fluttering sound when switching frmo cold-hot-cold. Then the other morning...nothing....won't go back to hot....Today I pulled out some of the bottom dash. the mechanical was working into the housing. I pulled heater hoses from the firewall and tried to blow out the lines with a garden hose. Didn't work put the hose in one hole and nothing on the other. I TOPPED OFF the hoses and tried to fill inside the tubes coming from the firewall. I reconnected and started the car....The familiar fluttering sound and HEAT!!!... I turned back to cold....fluttering....back to heat....NOTHIING... I repeated the procedure and again fulttering to HEAT!!! Leaving it there until summer....

  • threedchef Dec 18, 2008

    Same problem as jennyenivea!!! EXACT SAME THING!


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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.

Posted on Sep 19, 2008

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I got the part yesterday to fix this problem on my 03 galant es. its called the Heater Control Actuator Motor set me back 150 but was worth having heat. took me and my dad maybe an hr and a half to put it on and put the dash back together. can easily be done at home. it is not necessiary ro take the entire blower housing out you can access the part from the passenger side, after removing the bottom dash. it is located maybe 6inches about the heater core.

Posted on Dec 16, 2008

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I have the same problem with my wife's car and I replaced the actuator myself in about an hour and a half (nice to save the $500).

The problem is that the car is still blowing cold air. There must be something else controlling the heat door

Posted on Oct 27, 2009

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  • 1 Answer fixed for $489.00 (US)... quoted exact number because " yes we have done it many times before"..My wife has heat but I think its a really shoddy design error. This car has been very reliable other than this fault..but it stil leaves a bad taste.

Posted on Oct 30, 2008

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I have the same problem and my husband is working on it now! thanks!

Posted on Sep 23, 2008

  • krolls Sep 23, 2008
    I am guessing this is what it looks like... not much of a deal to purchase thru them after shipping. :(


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I had the exact same problem, yes it was the heater control valve, the repair was 285.00. The tech that replaced it told me it is a common problem for the Galant. He said that if you keep your temp selector on either all hot or all cold that it keeps constant pressure on the plastic gear teeth in the valve. As they break off one by one you begin to hear that clicking noise as the dont catch. When you finally break off the last one it stops working.

According to him if you always leave the dial at least one notch from fully hot or fully cold you will not experience a failure of the switch

Mar 24, 2009 | 2003 Mitsubishi Galant

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