Postby palmerwmd » Thu Dec 20, 2018 11:48 am
It seems to be a common idiosyncrasy of our systems.
..that coolant has a lot easier time going into the overflow but not necessarily back.
My Xterra (exact same engine, radiator, hose, overflow tank setup) was over 2 quarts short in the radiator the other month even though overflow tank was plenty full.
No sympton from the tempt gauge even as the vehicle had been driving in 96F traffic jams.
I had not checked the radiator itself since the overflow always looked good.
I have since replaced both pressure caps.
Albeit they were not OEM and even though the issue has not returned but I have done not a lot of driving with that vehicle so I think for my peace of mind I will go to the Nissan dealer and buy new caps for both ( they are different caps for overflow and radiator).
Last edited by
palmerwmd on Thu Dec 20, 2018 3:03 pm, edited 1 time in total.