Yep I agree on the heater core. Mine did the same

 

this happen to my truck and my heatcore was bad.... it took about 45mins to replace the heater core and get back on the road.. its a very very easy replacement even tho many many people will say its hard cause you gotta loosen the dash and etc but did it my self in my drive way in 45mins on my 2001 dodge ram 2500 4x4 quad cab short bed. i got my heater core at napa it was like 72 bucks

 

I am real curious how you managed to do a job that takes most folks several hours, in less than one.

 

Read post #9 and it might help answer your Q

https://dodgeforum.com/forum/2nd-gen...ml#post2632038

 

it was very simple. dash comes off very easy and same with the heater box and steering coulem and etc its a simple repair

 

well if u have any tips of how to make this job quick or whatever feel free to let me know.

 

Same here. I am getting ready to replace upper dash panel and while I have this apart I am thinking of replacing heater core. Not having issues with it, but if it starts in a couple of month, I will not be a happy camper. Might as well replace it while I am close to it anyway.

 

If your gonna have the dash cap off anyways its gonna be a heck of a lot easier and quicker.

 

wow so I've been trying to replace the heater core and man is this a bitch! I'm going to do a write up more then likely to help people in the future. A more step by step. Haynes sucks. the worst manual ever. Never helps me. It garbage. But I finally got the old core out and the new one in. Now i just have to put everything back together and I broke the clip on the end of the cable that has the park drive 1st 2nd reverse. Whatever that is called. I broke the end off. I have bolts everywhere I have to figure out where all this stuff goes. My dash broke like a champ when I pulled it out and so did the bezel or whatever that goes around the cluster. It cracked to. FML. I hope to have this done tomorrow. This is a super crappy job.

 

I did realize antifreeze was all leaked on the floor as I hadnt noticed the dampness before but when your laying on the floor you notice fast. I also found a ton of antifreeze in the holder the holds the heater core and some next to it under the dash. It was time to replace this bad boy.