The Best Cummins Coolant Leak Passenger Side Video 2026 Video And Photo Gallery #fyp

The most common cause of a coolant leak on the passenger side of a 6.7 cummins engine is a damaged or corroded heater core located behind the dashboard, resulting in a puddle of coolant in the footwell.

So i have been having the hardest time finding where i'm loosing coolant on my 16 3500 I recently replaced my resivoir because it would loose just enough coolant to make the low coolant light turn on and off. Just this week, and never before, i have a coolant leak that i cannot find I smell coolant both under the hood on the passenger side and in the cab There is no coolant smell to the exhaust or residue there I've lost over over 2 gallons in about 10 days and can't find

It's not dripping that's why not dripping as far as i can tell. Coolant leak issue over the past week, i've noticed coolant on the ground overnight on the passenger side under the reservoir area My coolant level sensors have been acting up Coolants above the full line So earlier started ripping it apart tonight, looking for a leak, and scratching my head now I am not finding any apparent leaks.

When adding coolant while the truck was running, i noticed it leaking slowly down into my wheel well

I couldn't see any leaks, but figured it had to be a cracked coolant reservoir. Well today the truck was leaking again, opened the hood and was actually able to see coolant leaking from the overflow reservoir It was a light stream coming from the seam where the top section meets the bottom. I popped the hood after i got back to the shop and saw this threaded metal fitting screwed into the head on the passenger side I was going to thread it out tomorrow, clean the threads, and wrap it with some new teflon tape.