[Frogman32]

I had a bad reservoir. The dealer tested it for me and it held pressure just fine. My problem was the overflow side of the tank was leaking so when coolant would be pushed over there it would leak out and there would be nothing to go back to the pressure side when the truck cooled off. I bought a Wherli tank and the problem was solved and it looked damn good. Lol. Replace the tank. You can find them online for about 150.00.

 

[Frogman32]

RD, that was exactly what mine was doing. The pressure side never went empty, just low. That’s because the pressure was never enough to empty the pressure side, just make it low. The dealership also tested my cap and it was good as well. I’d replace your tank.