Just had this same thing happen and the dealership says they can’t find the problem they did everything you did with a pressure test and nothing and tested everything with the cooling system and nothing so they are scratching their heads because it’s holding the 18psi but when I run it on the highway I lose like 1 to 2 gallons out of the reservoir bottle so I will have them check this and I am sure they did but I will ask again

Damn i guess i should have waited to jerk the head off pretty sure this was the issue

I have an 09 ram 2500 same symptoms how long did you have to leave 18psi on the cooling system before it started leaking out of the housing

Thanks a million!!!

Mine did the same thing 2018. Ram. It was the line on the firewall had small hole in it.

I picture my baby Jesus wearing a tuxedo while I pray to him this is my problem. I piece of glass on a bench with sand paper is an old trick to get a flat sanding surface. Not much flatter in the shop then glass.

What is that sensor for? Mine is broken off on my 2012

Lame -0 2000 u always change the thermostat when u do a radiator T sats always cause crap to break n the cooling system ..shade tree poser Lame

Hi Christopher I see it’s been eight months but was your truck running at normal temp and still bubbling at reservoir ? And is your truck still running fine?

Does it’s still bubble up in the reservoir after you fixed it .... cause mine does heat up anymore but still hear the bubbling in the reservoir