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Heat working on passenger side but not on the driver side.

Discussion in 'Interior' started by Liam Gracey, Nov 10, 2019 at 4:42 PM.

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  1. Liam Gracey

    Liam Gracey Junior Member

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    Hey there everyone,

    I have a 2013 ram 1500 reg cab and I had an issue last year and again this year with my heat not working on the driver side of the truck, it blows like warm air. I have flushed the heater core and changed the thermostat in the truck as well as new coolant. Both lines going to the heater core are hot (inlet and outlet) which makes me think it’s a blend door issue. I don’t have duel climate control but I have been reading up on these trucks more and I’m hearing it’s possible I have a blend door on the backside of the box that I’m missing? Is there a way to fix this without taking the heater box completely out? Or any solutions to fix it for just the winter ?

    Thanks for the help!
    Cheers
     
  2. Ricks Ram

    Ricks Ram Senior Member

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    If you don't have the Dual Zone there is not a blend door on the back of the unit. The only blend door that controls the temp on a single stone is the one directly behind the glove box.

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  3. Liam Gracey

    Liam Gracey Junior Member

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    Oh okay thanks that saves me some time taking the dash apart, but still stumped when it comes to what may be wrong with the system.
     
  4. Ricks Ram

    Ricks Ram Senior Member

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    I'm not sure why the passenger side would be different. I haven't had a regular cab apart but I can't see them being any different that the Crew Cab and Quad Cab and I have had both of them apart and the the single zone only has the one door for heat. There are actually two different air channels for driver and passenger that are controlled by one door that pivots between the two. I'm thinking it may be possible that the actual blend door broke and the passenger side is not moving with the driver's side. I actually removed mine to install Dual Zone so I still have my old Single Zone unit. I will see if I can dig it out and send you some pics of the actual door so you can see what I'm talking about.

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  5. Ricks Ram

    Ricks Ram Senior Member

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    Ok this is s pic of the actual blend door. As you can see one door controls both sides in the Single Zone application. The Dual Zone looks identical but the door is not one piece and pivots in the middle and the side of the door that controls the passenger side is the one I'm touching. On the Dual Zone that blend door motor is the one mounted to the back of the HVAC box to control that side but the Si gle Zone like this one just has the blend door motor in the front. I checked the door and it definitely had some flex but seems like it would be unlikely it would break at the pivot it the middle but it's possible. Another idea is that possibly something is blocking some of the air flow in the actual blend door or surrounding area. Possibly some type of nest or other issue. [​IMG][​IMG]

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  6. Liam Gracey

    Liam Gracey Junior Member

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    Awesome I’m going to investigate the issue in the morning and I will get back to you, very helpful!
    Cheers!
     
  7. Liam Gracey

    Liam Gracey Junior Member

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    I do believe that both the reg cab and the other variants are the same as this, only difference I could see would be the back seat airways but other than that it should be the same. Hopfully it’s an easy fix! once again thanks for the help.
     
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  8. Liam Gracey

    Liam Gracey Junior Member

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    so I opened up part of the dash and I tested all the actuators and they seem to be in good working order, I got a look inside and there isn’t anything blocking it that I can see without ripping the whole dash out of my truck, I’m seriously stumped on this one.
     
  9. Ricks Ram

    Ricks Ram Senior Member

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    That is definitely a strange one. There really isn't anything I can think of that could cause it if there is no impedance in airflow both sides should be the same temp. Are both sides blowing the same and is the temperature difference there even when you turn it to the dash vents?

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  10. thaddeous

    thaddeous Junior Member

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    I've been following this issue for a while and I have the same truck. Our heater cores are known to buildup sludge in the bottom of the core, and the bottom feeds heat to the driver side, and the top to the passenger. If you've got a noticeable difference in heat this may be the issue.
    Ill be tearing mine apart this month, (Canadian winter starting to kick in,) and can update you on what I come up with.
     
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