Question about 2004 Mitsubishi Galant

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No heat blowing 2004 Mitsubishi Galant ES

I’m not getting any heat blowing when I turn the heat control potentiometer to hot. When I turn the knob to the cold position the A/C works fine. I removed the glove box to examine the operation of the Air Mixing Damper Control Motor. When I turn the knob from cold to hot, the Control Motor rotates from the Max Cool position to the Max Hot position just like it is supposed to. I turned the temperature select knob back and forth and the Control Motor reacts correspondingly.
The heater hose connections at the damper control unit are very hot to the touch when the engine is running so the hot water must be flowing OK
So if the Air Mixing Damper Control Motor operates correctly from Max Cool to Max Hot and the hot water is flowing in and out, then what else could be causing no heat to blow?

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The hot water hose presenting at either end of the heater core doesn't mean coolant flowing through it. It could be stagnant and it doesn't effect you coolant since it is just a branch off.
1- One thing could happen is that heater core is clogged up.
2- The other thing is that there is a valve control temperature knob to allow high or low of hot coolant flowing through the heater core per desired temperature is not operated.
Check these out.

Posted on Sep 12, 2009

  • Kevin Martin Nov 26, 2011

    I have found the answer and its pretty easy to fix if you have a basic mechanical know how. I was working on a 04 galant 4cyl blowing no heat and ac was working fine ALONG with the acuator arm oving but still no heat on the 04s the acuator control a valve and the belend door flaps well behind the acuator there is a arm that controls the blend doors and bihind that there is a slot that the blend door arm fits into its a valve that controls the flow to the heater core and where it was slotted the plasic was partialy broken so i took some pliers moved it till i had heat and put gorialla glue on the arm end and stuck it in the valve and put the actuator back on let it dry and walla it works great know just thought i wood let you all know a cheaper way or fixing rather than pay hundreds to have the heater core replaced as the part is part of the heater core



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No heat or cold air will come out of my2004 Mitsubishi Galant. I took off the dash panel behind the glove box to get to the Blend Door Motor, but after turning the air from hot to cold at various speeds,...

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Read more: How to Troubleshoot the Air Conditioning in a Mitsubishi Galant |

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