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I have a 2002 Dodge Ram 1500 4.7L. I am having a problem with my heater. The left side blows cold and the right side blows warm. The left side will blow warm for about 10 to 15 seconds and will slowly go to cold. The floor blows cold. The only thing that blows warm is the defroster. I have recently found out that my coolant tank has a little crack in it around the lid (cap). Could this be causing the problem since it isn't able to build up pressure? The coolant has boiled over and the coolant level is low. Or do I have another problem? Also does anyone have a coolant tank for sell? I am having a hard time finding one. In my line of work you would think it would be easy, but nope... harder than I thought since they make so many different types. Here is the OEM part number... 5072602AA
 

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Welcome to the forum... Glad to have you here... You will find that there are a ton of talented people on here with a passion that we share... Glad to have you.... I hope you get your problem resolved.....
 
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