MacBook Pro runs fans at full speed constantly I have a 2009 MacBook Pro A1278 running at 6500+ RPM all the time.

When I ran the hardware test, it showed:


  4MOT/1/40000003: Exhaust-7358


I tried NVRAM reset, SMC reset. Nothing worked.
Your temperature sensors could be mis-reading. What do they report? You can check them with a program like iStatMenus. If the readings are stuck on the max temperature the fans would stay on.