This is my first post. My truck 2001 2500, 360, 5 speed, 4WD. Here's the problem. I just replaced the heater core and thermostat (195 degree). I still have the gurgling sound in the heater core box, and the radiator cap does not get warm. I do have heat, and the gurgling is mostly when I'm accelerating. I don't smell glycol in the cab and the oil is clean. When I did the heater core, I did not remove the whole box, just tilted it back to slide it in. On that note, this is the third heater core, 175K miles. The last two times I removed the whole box. I think taking the whole box out is worth it.
Back to my questions, why isn't the radiator coming up to temp, and what the gurgling?

 

Still have air in the system. These trucks are notoriously hard to get all the air out.... heater core is the highest point in the system unfortunately, so that's where the air collects. Some have had success with parking the truck at a STEEP angle, and trying to burp the system some more. Generally, the more pucker-factor on where you park, the more successful it is......

 

I think this is it. I tried vacuum filling a system once and it still didn't do the trick. I think best here is crude and old school: try to get filler cap higher than core, let it idle, squeeze upper rad hose repeatedly (esp while t-stat is open), and preferably use one of the funnels that attaches to the rad neck so you can "overfill" while cap is off.

Even this isn't perfect but has worked well enough for me.

 

Captain Hey you. Thank you. Burping is much easier then the options I was looking at.

Pete

 

Did it work??

 

Did it work? If so, did you use something like this to raise up the coolant fill point above the height of the radiator to help get the air out? - https://www.harborfreight.com/no-spi...kit-58423.html

 

I have one of those. I love it.

 

Read post #14.
https://dodgeforum.com/forum/2nd-gen...p-bleed-2.html