Fan is constantly running and is loud.

My laptop's fan has been constantly making this loud noise and is always running a speed of 6000+rpm. I also tried doing the SMC but no progress. When i start my laptop, the fan starts constantly running at a high speed. I also opened the laptop to clean the fan with a dust blower and yet nothings changed. I then resulted into the Apple Hardware Test, and they detected a error, "4MOT/4/40000002: Exhaust - 7022". If anybody knows what the error is, can you please let me know how i can fix it also?

Thank you so much, truly appreciate it :)

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Thermal Sensor Issues

If the fans run at high RPMs, but the computer does not boot, there is probably an issue with the thermal sensors.

This model features a thermal sensor on the heat sink. First, ensure that the thermal sensor on the heat sink is plugged into the logic board. If it is, try replacing the heat sink. If this does not fix the problem, the logic board most likely needs to be replaced.

MacBook Unibody Model A1278 Troubleshooting

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