Originally Posted by HeyYou

Yep, it's a common problem as the trucks aged. I don't think they originally came with two check valves, may have come with none..... don't know. Will the additional canister make a difference? Depends on the size. Bigger it is, the less of an issue it will be. Might even be able to find room under the cowl to mount it. So, out of sight.

Originally Posted by MoparFanatic21

They had none installed from the factory but issued a TSB and installed a check valve the size of a 52mm film canister (size of the reservoir)

Originally Posted by River Brooks

Okay thanks guys, tomorrow I will get once from autozone, the black circle universal one again. Install it after the HVAC check valve and report back. Fingers cross this works!

Originally Posted by Moparite

You can read the tsb here. Make sure you put the the check valves on the correct way or they will do nothing to solve the issue. I replaced my check valves with napa units. https://www.napaonline.com/en/p/NDP7301349

Originally Posted by MoparFanatic21

They didn't use one like that but it might work they used this one on the HVAC line.

Originally Posted by River Brooks

This is the one I ordered from there today, will this work?
https://www.autozone.com/engine-mana...E&gclsrc=aw.ds