From the looks, Those flat mount oem thermostats have a jiggle valve, if he replaced the old with a new oem 19300-hn2-003 and it's still acting the same.
I've Purged cooling systems this way >> leave the stat out, YES crack the cap, and bump the rpms up to force the coolant to cycle.
We need pics of the relocate.
Sounds to me like The issue is here ^^^
I've Purged cooling systems this way >> leave the stat out, YES crack the cap, and bump the rpms up to force the coolant to cycle.
We need pics of the relocate.