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No Heat

johanh13

johanh13

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So it's cold and now I notice that my Ram is not heating! It switches from floor to face to windshield just fine, also recirc mode works, and the fan is working. However, even with the engine fully warm and the setting on 'HI', the air is not even warm. Any ideas?
 
Could be a few things like blend door, heater core plugged (that usually happens slowly) or air lock in the heater core
 
OK, so the 'no heat' is only on the drivers side. Passenger has heat when engine is warm. Any ideas, anyone? BTW, it's 7°F this morning...
 
Got a new Mopar engine coolant thermostat housing being shipped for our Ram 2500 6.4L. Just changed the blend door actuator motor even though it was working, I figured it wasn't closing tight enough. That didn't help. We live on a long steep grade in the Rockies where our current daytime temperature is minus 6F. Finally figured it out by checking the coolant temperature with the engine warm going down it ran at 179F, but going up it was at 203F. 179F isn't warm enough for negative temperatures. 203F wasn't bad for interior heat so it got warm inside. Thermostat isn't closing tight enough. There is more heat on the passenger side due to it's closer to the heater core. Our 2500 Tradesman doesn't have separate climate controls for driver and passenger.
 
Last edited by a moderator:
In a another automobile I own had no heat with low coolant. I topped it off and it ran fine on a ten hour return to home trip. The coolant level was stable before and after that event, so who knows why.
 
dieselscout80 said:
In a another automobile I own had no heat with low coolant. I topped it off and it ran fine on a ten hour return to home trip. The coolant level was stable before and after that event, so who knows why.
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Coolant level is fine... the thing is it worked fine till about a 2 weeks ago, and passenger side works too.
 
Do you get air out of the driver's side vents?
 
Is it dual zone heating? I would assume with it being a limited yes it is, if so I would look to see if the drivers side blend door is operating since the passengers side is fine.
 
H3LZSN1P3R said:
Is it dual zone heating? I would assume with it being a limited yes it is, if so I would look to see if the drivers side blend door is operating since the passengers side is fine.
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What is the procedure for checking that ?
 
with a dual zone (separate temp controls for driver and passenger) you probably have a stopped up heater core. sand and sediment from the coolant can settle at the bottom. drivers side pulls from the bottom, passenger from the top.
They were terrible in the old JK wranglers for this, but it can happen with any dual temp system
 
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