No heat in 2017 Ram 1500

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toddcarlson10

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I bought a 2017 Ram 1500 5.7 Hemi with dual heat. I recently noticed that there is no heat coming from the vents. The fans are fine and function as expected. I replaced the thermostat, topped off and burped the coolant, checked the fuses, noted that both radiator hoses were hot, and the engine runs at the correct temperature. With all these in mind, the air is consistently cold throughout all vents. I don't believe it is the heater core because both radiator hoses are hot. Would this be the air blend door actuator with the temp the same in all the vents? What else can I do?
 

jws123

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Most likely a blend door actuator a good scan tool will tell you what one usually throws a code for it wont set engine light off if it was the heater core which does happen you would still have warm heat.
 
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toddcarlson10

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Most likely a blend door actuator a good scan tool will tell you what one usually throws a code for it wont set engine light off if it was the heater core which does happen you would still have warm heat.
it just got scanned by the shop and only came back with there was a fault in the humidity sensor module. Can I have faulty doors even though there is no code?
 

GTyankee

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Did you go to a Air Conditioning/Radiator Shop for that diagnosis ?

An Auto Parts Store can't really help you

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watch these videos, it may help


The thing is, you mentioned that you have the dual zone controls.
Make sure that if it is that part, that you get the Correct unit
 
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18CrewDually

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You mentioned both Radiator hoses are hot. But are both Heater core hoses hot?
I'd backflush the heater core. It doesn't take much for Mopar heater cores to clog and lose the heat transfer. On past Dodges I've even filled the heater core alone with a mix of water and CLR to help dissolve then followed with a garden hose backflush followed by a 20psi shot of compressed air to restore heat after reassembly.
 

GTyankee

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At this time, the only hoses you should be checking, are the 2 hoses going through the Firewall.
They are about the size of a garden hose

i found this old post
Great images

 
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Jeepwalker

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Ive read reports by other forum members with a bad humiity sensor which had hvac issues (usually cooling). So let us know how it goes after it's replaced.
 
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toddcarlson10

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So I replaced my blend door actuator and had no heat. When changing the temps the flap did not move on the actuator. Could this be due to a faulty HVAC control module?

If not the module it may be worth looking again into the heating core.
 

Fast69Mopar

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So I replaced my blend door actuator and had no heat. When changing the temps the flap did not move on the actuator. Could this be due to a faulty HVAC control module?

If not the module it may be worth looking again into the heating core.
If the blend door actuator does not move from inputs on the HVAC Control Module like changing the temperature then you could have an issue with the controller or the wiring.

When you replaced the actuator did you attempt to operate the blend door manually to see if you could turn it in either direction stop to stop?


Next in line would be connecting a quality scan tool to the truck and performing the HVAC actuator calibration..

If you still do not have blend door operation a quick glance at the wiring diagram and a DVOM will help you determine if the problem is with the control head or the wiring.

What year is your truck?
 
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toddcarlson10

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If the blend door actuator does not move from inputs on the HVAC Control Module.

When you replaced the actuator did you attempt to operate the blend door manually to see if you could turn in in either direction stop to stop?



Next in line would be connecting a quality scan tool to the truck and performing the HVAC actuator calibration..

If you still do not have blend door operation a quick glance at the wiring diagram and a DVOM will help you determine if the problem is with the control head or the wiring.

What year is your truck

It is a 2017. The actual blend door knob doesn't move. It is only the flap on the truck itself that the blend door attaches to moves.
 

jws123

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It is a 2017. The actual blend door knob doesn't move. It is only the flap on the truck itself that the blend door attaches to moves.
Remove the actuator you should see a little white piece you can turn that moves the door inside the hvac box if it doesnt move then that is your issue .
 

Marshall

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I have not had to dig into mine, but can you hook up power to actuator with it out to see if it turns? incase the door is jammed.
you should be able to hear it trying to run even if the door is jammed ,I think.
 

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Do you get ANY heat out of either side of the vents?

Is there cold air blowing in as you drive?
 

TorqueWagon

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I bought a 2017 Ram 1500 5.7 Hemi with dual heat. I recently noticed that there is no heat coming from the vents. The fans are fine and function as expected. I replaced the thermostat, topped off and burped the coolant, checked the fuses, noted that both radiator hoses were hot, and the engine runs at the correct temperature. With all these in mind, the air is consistently cold throughout all vents. I don't believe it is the heater core because both radiator hoses are hot. Would this be the air blend door actuator with the temp the same in all the vents? What else can I do?
I had a 2007 ram. Several of the plastic pieces that connect to the shaft of the actuator on the blend and mode doors broke such that the doors were inoperative or partially. What you're describing sounds a whole lot like my case. I don't know if they've made any changes after my model year but this sounds very much like mode and or blend doors. In my truck it's very invasive to get to the heating unit and open it up. I don't know if it would be any better on your model and year. This kind of failure is quite common on higher mileage Ram trucks.
 

nlambert182

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They did.... blend door motors on the 3rd gen trucks are not the same as the 4th. While it is still possible to have an issue, they're much less than in previous year trucks.

Now the #1 issue are clogged heater cores.
 

Markusbainus

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Do you get ANY heat out of either side of the vents?

Is there cold air blowing in as you drive?
Sorry to jump in but I've been looking for this. I can feel cold air when I drive, would you be able to post on my thread please
 
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Tyler_h

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Similiar issue. Passenger side heat is hot, drivers is luke warm. I have the glove box off and the white tab moves with a temp change. It seems that I get more heat out of the drivers side when idle vs driving.
 

GTyankee

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Every 2009 - 2018 plus other Ram DS Classic models

With the Lower Glove Compartment Removed
If your Ram was built after January 2016, it came with a Cabin Air Filter,
It could be very dirty, Remove the CAF Door & pull the Filter out
Then
you should notice the BLEND DOOR ACTUATOR, just to the left of the HVAC Fan

First, operate the HVAC Controls & watch the Actuator, on the right side of the actuator, Do you see Movement ? Does the White thing move up & down ?

Just make one more check,
take the 2 screws out of the actuator.

Then grab the White thing with your thumb & finger,
Do not use major force, but turn the lever Up & Down
You should HEAR the Door inside the box, when it hits the furthest UP & Down Positions, like a THUMP in each position.
..........................................................

Now you can remove the surround around the Radio
There are plenty of YouTube Videos on either type of Console your Ram has

There are 2 more actuators below the HVAC Controls

Follow the Actuator & Door Instructions as written above
IF you do hear that Thump, that means that the door inside is working as Designed
If the Actuator did move the White Lever, it is working as designed.

While you are doing this, check your FAN for a change in Speed, using the HVAC Controls.

=====================
i hope that i covered it correctly, it is almost 2 AM & i am a bit tired
 
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