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


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  #11  
Old 11-27-2009, 02:43 PM
sherfield2002 sherfield2002 is offline
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Ok, so here's an update on this issue. I ordered a Heater Treater Blend Door and when I disassembled the dash it turns out the blend door is fine and working properly. My next thought, as some of you suggested, is a clogged heater core. However, both heater hoses get hot, so I'd think the heater core would be ok, correct?

Thermostat has also been metioned, but it reaches operating temp just fine.

What should I do, go ahead and flush the core and replace the t-stat? Look somewhere else?
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  #12  
Old 11-27-2009, 03:54 PM
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Mode and blend doors are notorious for breaking in DR trucks. Id check those first along with making sure both heater hoses are hot.
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Old 11-27-2009, 04:18 PM
sherfield2002 sherfield2002 is offline
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Another update, flushed the heater core, but it didn't change anything. Still blows hot for about 5 seconds then cools off.

Also, should my passenger floor board be wet after the flush? It appeared to be only water, not coolant. I thought maybe water got through the opening in the firewall where the heater core ends come out. Or could it be worse, like a leaking core? I haven't noticed any coolant smell or wet carpet before the flush.
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Old 11-27-2009, 07:41 PM
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No, you shouldn't have any moisture in the interior. Its possible you may have sprung a leak if you flushed the core with high pressure water. Remember, the cooling system is designed for 16 psi when its new. A weak core would be more susceptible to leaking after a flush.
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Old 11-28-2009, 02:25 AM
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or the heater core is blocked and needs flushing it could be a number of things
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Old 12-07-2009, 05:17 PM
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Your heater core could be partially blocked allowing it to flow hot on both hoses but not putting out enough heat. I just changed my core this weekend for this exact reason.
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Old 12-07-2009, 05:31 PM
sherfield2002 sherfield2002 is offline
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I probably do need to change the core, but it seems like a PITA to do.
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Old 12-07-2009, 07:21 PM
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Give these guys a try. They even respond well when you contact them.
http://www.heatertreater.net/
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Old 12-07-2009, 08:13 PM
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See my previous posts. I have already purchased a blend door from heatertreater, but didn't need it as my oem blend door was fine.
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Old 09-28-2010, 02:47 AM
cgallen cgallen is offline
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The HVAC system on the RAM is a dual chamber system that is configured as either single or dual control(separate temperature control knob for passenger side). On the single control a difference in temperature between the passenger and driver's side can be due to a temperature gradient across the heater core. The flow through the heater core is a single input that spreads into multiple flow channels then comes back together at the exit hose. Half the channels span the driver half of the plenum box and half for the passenger.

The core tends to build up blockage on the passenger half of the core over time and you'll find diminished heat on the passenger side over time. The diesel engines seem to be particularly susceptible to this problem. The solution is an aggressive radiator flush to clear the core. Prestone makes a good flush kit with cleaning chemicals that is available at Walmart. You can disconnect the heater hoses and flush backwards and forwards to clean it out. You also need to flush the entire radiator system to keep more gunk from just clogging up half the core again. Routine radiator flushing is supposed to be ongoing maintenance and is especially important on the RAM. If it's been more than two years...FLUSH! I got all this information from the guys at HeaterTreater. They are awesome and I installed their Mode 1 door and re-circ door fixes on my truck with great success at signficant savings over what the dealer wanted.
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