No heat - 2014 1500 5.7

Zanderson · Feb 21, 2022

I have a 2014 1500 with the 5.7 and I am not getting hot air out of the vents when it is warm and running around 210. Did a coolant flush and replaced my thermostat thinking that might help, but it hasn't changed a thing. I've also tried switching climate control to recirc, also to no avail. It finally will get warm-ish after driving 45+ minutes. Doesn't matter what setting I have the climate control on. Has anyone else had this issue or have any other ideas I can try to get this fixed?

jws123 · Feb 21, 2022

Make sure the system is bled really good and no air in system plenty of vids on it. Did you flush the heater core yet? it appears a lot of 4th gen rams are having clogged/failed heater cores lately I personally have done 4 because they clogged up/fell apart on the inside or something.. Its starting to become more common then cam failures lol

GTyankee · Feb 22, 2022

which HVAC Controls do you have ?

mtnrider · Feb 22, 2022

Clogged heat core, extremely common issue with these trucks. You can try to flush it like described in this video but you have about a 50/50 chance of fixing it. It may need to be replaced (big pain in the a$$)

Flushing A Heater Core

Come along with Eric O. at the SMA shop as we diagnose and repair this 2013 Ram 3500 Cummins that came in with a complaint of no heat out of the dash vents. ...

www.youtube.com

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Wulf · May 29, 2022

Sounds like could be air in the lines leading to the heater core, or the core could have gotten clogged up, like the other suggestions before me.

GTyankee · May 29, 2022

I am curious, i just read another post about plugged HVAC heater cores that have been replaced, going bad more than once.
Casting sand has been mentioned

I have to wonder, has anyone blown a few pounds of air pressure through a brand new heater core ?
Did casting sand come out the exit ?
If there was no air put through the system, how does anyone know ?

Once a liquid is put in the core, the sand may cake in the tubes & cause a blockage ??

crash68 · May 29, 2022

GTyankee said:
I have to wonder, has anyone blown a few pounds of air pressure through a brand new heater core ?
Did casting sand come out the exit ?

The heater cores are made by extrusion, there is no form of sand involved in that process.

GTyankee · May 29, 2022

So the only area that could have casting sand, would be in the water jacket of the engine

BossHogg · May 29, 2022

GTyankee said:
So the only area that could have casting sand, would be in the water jacket of the engine

which circulate throughout the cooling system and it appears the casting sand can collect in the heater core. So your question in post 6 seems valid.

OP, try seeing if the lines going to and from the heater core are warm/hot. That will tell you if the core is slow/plugged or an external issue.

No heat - 2014 1500 5.7

Zanderson

Junior Member

jws123

Senior Member

GTyankee

Senior Member

mtnrider

Senior Member

Flushing A Heater Core

Wulf

Senior Member

GTyankee

Senior Member

crash68

ACME product engineer

GTyankee

Senior Member

BossHogg

Senior Member

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