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Heating & Cooling 3rd Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #21  
Old 12-13-2013, 10:47 PM
Rockstar 414 Rockstar 414 is offline
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I'm having the same problem with my 03 , no heat on the drivers side and heat on the passenger side . When you say flush the heater core , do you take the top off the rad and stick a hose in there and turn it on then open then drain port in the rad to flush it ?
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  #22  
Old 12-13-2013, 11:11 PM
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You need to flush the heater core itself. It's a mini core similar to the rad only mounted inside the heater unit under the dash. There are two hoses that run up the passenger side of the engine from the water pump area up the the heater core inlet and outlets protruding from the firewall. Disconnect both these lines and alternate running water thru each of them.

Sometimes the two lines running to/from the heater core have a plastic joint with a couple hose clamps so they are easier to pull apart and flush.

I usually run one line into a bucket and then attach a hose to the other so I can flush and catch and see what comes out of the core. Usually it's a lot of flake with a couple chunks of silicone gasket clumps.
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  #23  
Old 12-15-2013, 04:02 PM
Morlow Morlow is offline
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It's good to hear someone finally found a fix for this. My '02 is having the same problem. I may have to try this fix after winter (I don't have anywhere to attempt this until March).
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  #24  
Old 01-10-2014, 12:25 PM
tlvzee tlvzee is offline
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Post cold driver + warm passenger = heater core (for my truck)

I just replaced the heater core in my 2002 1500 quad cab (dual zone control). I had the same problems, no heat on drivers side, warm on pass. side. My core ended up corroding and leaking out of the back side. As it turns out, the rear of the heater core was plugged and that's the side of the core that heats the driver because the dual zone system uses two independent blend doors that are split with one set above and another set below the heater core inside the HVAC box.

I suppose flushing the core might be something to try, but I knew mine had been leaking for a while. The antifreeze even soaked and degraded the foam on some of the blend and mode doors bad enough that I had to replace it with some weatherstripping from the hardware store.

Sounds like some guys are having troubles with broken blend doors and such and many of them recommend the heater treater, but everything on mine looked good, besides the core and some rotten foam.

I decided to put in a new A/C evaporator too, since it was all in there together.

I'm really glad I did it on my own. Learned a lot through the process and saved a ton of $$.

Hope this helps anyone out there with similar problems. GOOD LUCK!!
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  #25  
Old 02-01-2014, 01:30 AM
dz1976biker dz1976biker is offline
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Wow seem like everyones having the same problem of having no heat on the driver side and only some heat on the passenger side. Well check this out. I've got NO heat on my passenger side and very little heat on the drivers side? And that very little heat only works on the lowest control settings. If i turn the heater up it only ends up blowing cold air. I'll turn it off, wait a few seconds and turn it on and it'll be warm again for only a few second. Again only on the drivers side. Mines a 2002 Ram 1500 4.7. I bought it a year ago with 94000 on it. Since i"ve had it I put a new motor (the old one ended up with probs cause some ******* decided to put a shitty weld in the radiator, but thats another story), and replaced the rad, thermostat, waterpump, and the place i bought it from put a new heater core in it. I did't replace any of these parts myself so I don't know the quality of how they were installed. Sounds like my problems are the same as everyone elses accept I have no heat on the passenger side and minimal heat on the drivers side. Where shall i start to fix this? Anyone have a course of action on where to start and to move on from there?
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  #26  
Old 02-01-2014, 10:55 AM
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In your case I would start by verifying that all your blend doors are connected and working properly.

It probably wouldn't hurt to backflush the heater core as well. It's not clear if the heater core was replaced before you bought the truck or after the engine was replaced but either way, it has small ports and is easily plugged by any debris in the system.

Overheating an engine loosens a ton of flake and debris from inside the block and would definitely cause this issue.
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  #27  
Old 02-05-2014, 10:54 PM
dz1976biker dz1976biker is offline
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Ok cool. I'm going to flush the heater core first and see if I can at least get some good hot air to come out of the driver side vents. I flush and change my coolant on all my vehicles once a year anyway and it's bout due. If that works then I'll move on to them blend doors. Is that heatertreater joint really a good place to get them if needed? I'll keep posted on if i can fix this damn thing. I'm a determined SOB and I WILL FIX THIS!!!!! Imma get to it this month sometime. Preferably soon. Preciate it bud !!!
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