V6 3.5

2001 Nissan Pathfinder

4x4 with 101,000 miles on it. Heater works while idling Once moving about 4-5 miles it will blow cold air and shortly after temp gauge goes to hot. Radiator, thermostat, water control valve, and water pump have all been replaced. System has been pressure tested and bled. Still has same problem.
January 23, 2007.

Take the Stat back out-start it up run it for 10mins, hop inside do you feel more warm and cozy-if so change the Stat again might be Manu. Defect.

Jan 24, 2007.
While it certainly is quite possible of a bad t-stat even though it's new, Try bleeding any air in the system again.