I have a 2002 Nissan Sentra. In Nov. 2010 had inspection done and replaced upper radiator hose at that time. Right after that, I had no heat and the temperature gauge would go up to hot but then come right back down. Brought it back to mechanic, changed thermostat and both things ok only part way h…

No heat and temperature gauge going up and down

circuitsmith May 11, 2011, 6:06pm 4

Something to try:
Park on a steep incline, pointed up.
Let the engine cool.
Fill the radiator.