Question about MTX Dodge Ram Quad Cab 2002-2003 Thunderform, Loaded with Dual 10 Inch Subs and Amplified, Charcoal Car Speaker

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03 Dodge Ram 1500 cold air on driver side, warm air on passenger

I get cold air from the driver side vents and luke warm air from the passenger side vents when I try to heat my 2003 Ram 1500. I've read almost all of the 315 posts to this site about blend doors. I've taken the dash out, down to the point where I can somewhat check all four actuator motors and flapper/blender doors. The only motor I didn't physically remove was the one that you have to cut out the metal framework, but I could see movement of the small doors that open the air to the foot/floor warming vent by using a flashlight and looking into the vents near the floor of the center console. Examining the four actuators and doors as best that I could, here are the results (the four actuator motors are labeled with a white sticker on the wire leading to them):
Actuator Recirculation Motor (on the far right of the unit) - Moves the large recirculation door that I can see and feel by removing the recirculation fan on the passenger side.- mine operates properly by changing from a Max setting to any standard setting for the area desired to be heated or cooled (switch on the far right of the three climate control switches) I can actually view the door moving and it is intact.

Actuator Driver (second actuator motor from right side that operates two doors in unison) - Motor operates properly when selecting the middle climate control switch to either hotter or colder. The actuator rotates properly with switch movement. I disconnected the metal connector that operates the two flapper/blender doors in unison, and both doors appear to feel normal but I cannot visually see them.

Actuator Mode 1 - I was able to remove the actuator motor and it rotated properly when the correct console switch was moved (can't remember which one). By moving it with my hand, I was able to turn the white mechanism that the switch controls, and feel that the door seemed normal and that the limit stops were working properly. I could also determine, that by manually moving the door while the blower was on, the air would change direction to the correct area.

Actuator Mode 2 - I cannot access the motor to remove it since it is behind the metal framework that the repair video says would need to be cut out, but by looking into the floor area vents with a flashlight, both doors seem to move properly when going from floor selections to defrost selections on the middle console switch.

Both of the hoses to the heater core feel warm when I checked them from the engine compartment at the point they enter the firewall. There is also a proper level of radiator coolant/antifreeze and the Air Conditioning cools just fine on a hot day.

I still cannot determine why I would be getting warm air from the passenger side and cold air from the driver's side. Please help.

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  • jetbridge Jan 14, 2010

    I had to take out the dashboard to remove the entire heater "box". This showed all four actuator doors and motors to be working fine. At this point, I took it to a mechanic and discussed it with him. We agreed that the only thing left in a heating system would be the heater core which is also inside the box. The part was $125 and the mechanic charged 2.5 hrs labor to drain coolant, replace core and reinstall the dashboard and trim. ( the book called for 4.9 hrs to replace the heater core but since I had most of it removed, he was able to cut the price since most of this was labor intensive.) $360 out the door. Works perfectly. I think the heater core was partially blocked and was only circulating across half the core, therefore giving lukewarm air and only on one side due to the design of the doors and core location. Good luck.

  • jetbridge Jan 14, 2010

    I had to take out the dashboard to remove the entire heater "box". This showed all four actuator doors and motors to be working fine. At this point, I took it to a mechanic and discussed it with him. We agreed that the only thing left in a heating system would be the heater core which is also inside the box. The part was $125 and the mechanic charged 2.5 hrs labor to drain coolant, replace core and reinstall the dashboard and trim. ( the book called for 4.9 hrs to replace the heater core but since I had most of it removed, he was able to cut the price since most of this was labor intensive.) $360 out the door. Works perfectly. I think the heater core was partially blocked and was only circulating across half the core, therefore giving lukewarm air and only on one side due to the design of the doors and core location. Good luck.

  • robdean
    robdean Oct 17, 2012

    I have the same trouble, Ive done the exact same thing you have. Check all doors,seem fine, I have flushe out the core before, makes no diff still cold on driverside. I have the dash apart now and dont know what else to do??? Help NEEDED!

  • Kyle Remi Aug 24, 2013

    i had the same problem and lou and behold the r134a was only sittng at 16 psi, topped off and working great. thanks for the help!! =)

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Mine was cold on dr. side and warm on pass. side during summer and reverse in winter,turns out it was just a little low on freon.put a shot in and it works great now.

Posted on Jun 23, 2010

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I had the same problem took the dash off and everything was working. I read one of the responses and went to Autom store and got a can of freon with the gauge on the tube $26.00. came home it read low and I filled it. Started working immediatly.

Posted on Jul 10, 2010

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Did you ever find out what your problem was i am have the same problem if you got it fix please help and how much it cost

Posted on Jan 13, 2010

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Try going to a good rad shop they can probabl;y help you out with most heater problems call one first to see if they can answer your [problem they will tell you if they can or can't

Posted on Dec 23, 2009

  • red echo 02 Jun 24, 2010

    a lot of the heater problems can sometimes be in the rad or heater core a good rad shop can usually apply pressure to the heating system and clear it up.Call one and explain the problem. They will tell you if they can help you or not

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