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


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  #11  
Old 08-03-2013, 11:11 AM
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when your flushing the heater core it will help if you back flush for a few minutes than switch heater hoses and flush it again and than back flush again. if you get the water moving through it in both directions like that it will help dislodge anything that might be in there.
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  #12  
Old 08-03-2013, 05:27 PM
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I just finished the flush. Everything went well. I was able to flush without the garden hose. I flushed the radiator, then took off out the thermostat, took off the lower radiator hose and flushed. Then took off the heater core hoses and back flushed that with distilled water and compressed air. The old coolant was really clean.

My dilemma: Its supposed to take 4.6 to 4.7 gallons of coolant. I put in 1 1/2 gallons and it wont take anymore. Im guessing theres air in the lines but I cant figure it out. I squeezed the upper radiator hose and the heater core hoses and got a little more in but not a lot.

I just drove about 10 miles and the temp stayed normal. Im hoping that when it cools down Ill be able to add another 2 gallons but that probably wishful thinking. Any thoughts on what to do?

EDIT:

Also, I forgot to mention I started the engine with the Upper, Lower, and heater core hoses off and the heater turned to max heat so I know the block, radiator, heater core, and expansion tank were all empty.

Last edited by hriczko806; 08-03-2013 at 05:31 PM.
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  #13  
Old 08-04-2013, 11:50 PM
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When I flushed mine I added pure coolant. I knew how much needed to be added to get me in the ballpark for a 50/50 mix. Then I drained some and kept adding until I was set. I suggest getting a hydrometer. Just make sure you are sure you have all the air out of the system before you start making adjustments. Run the engine between each adjustment let cool and measure.
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Old 08-05-2013, 12:17 AM
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you may have a vapor lock in the heater core. did you let it run with the rad cap off until the thermostat opened? you will see when the t-stat opens the coolant level will drop in the rad as it pulls coolant into the block. if you have a vapor lock in the heater core you will have no heat inside the truck. if that is the case and running it with the rad cap off don't cure it take off the top heater hose (after the engine cools down) and use a funnel and pour coolant into the heater hosewhen it starts coming out of the engine where the heater goes on that you pulled off starts pushing out coolant put the hose back on and run it with the rad cap off again to push out any remaining air.
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Old 08-05-2013, 07:58 AM
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After a couple days of driving the temp is staying just below the half way line on the gauge. I have heat and the hydrometer says Im protected against freezing and my boiling point is high. It seems like Im okay... I just dont know why I have som much coolant left over. I have something like 6 1/2 gallons of old coolant (Mixed with water) that I have to dump. So Its not adding up.

My upper radiator hose is easy to squeeze which makes me think that air is still in the system. So maybe Ill try the heater core thing, but like I said I have heat.

Also, I ordered some Ph test strips so if they come up normal then I guess I should just leave it alone.
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  #16  
Old 08-05-2013, 10:20 AM
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hmm just noticed you're actually kind of close to here.
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  #17  
Old 08-05-2013, 12:26 PM
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run it up to temp with the rad cap off and watch the coolant level.
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Old 08-05-2013, 04:31 PM
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Well just an update. I ran the engine till it was at temp and it stayed at the same level. Completely full. I squeezed the upper radiator hose and saw some bubbles which I thought was good but the fluid was high and started overflowing so I stopped. When it cooled down I noticed it sucked in a good amount of fluid from the expansion tank. I also squeezed on the upper radiator hose again and it felt empty so I took it off on the radiator side just to fill it but to my surprise it was completely full.

I'm assuming the system is completely full. I have hot air through the heater so it seems like that's a sign there is no air in the heater core, and the hydrometer says its protected to -40 degrees F and a boiling temp of 265 degrees F. I ordered coolant Ph test strips so as soon as they arrive ill test the coolant again. Most importantly the engine is staying cool so I'm out ideas.
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  #19  
Old 08-06-2013, 12:54 AM
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it must be full. just keep the expansion tank full and if it needs more it will pull it in.
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  #20  
Old 08-08-2013, 02:22 PM
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I just got the Ph test strips in today and they say that the coolant is good. The Ph is at about 8.0 which they say is right where you want to be. I used CoolTrak Ph Test Strips. I guess Im good for another 5 years now.
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