1
Score
Ashersdad
13
Asked
Why are my fans constantly running?
A bunch of my keyboard keys didn't work, so I replaced the keyboard without any problems... Well... No problems with the keyboard replacement, but now the fan constantly runs at full speed. I have SMCControl running and it reports that the temperature is 39 degrees C, and yet the fans are running at 6000 rpm.
While I was inside my laptops innards I blew out as much dust as I could with canned air. (Amazing how much there was... Ick...)
I don't understand why the fans would be running at full speed if the temp sensor reports that the temperature is low.
Can you help me out? I appreciate it.
1
Score
Matt Barnes
6.6k
Answered
Accepted Answer
Usually that problem is caused by disconnected thermal sensors. Check the left and right thermal sensors to make sure they are plugged in. You can see where the thermal sensors are plugged-in on step 16 of the left thermal sensor guide. The left thermal sensor connector is located in the middle of the upper half of the logic board and the right thermal sensor connector is located just below the right fan connector.
1
Score
ordody
25
Answered
This could also be due to a different problem. Check your activity monitor for any processes that run higher than, say 80% at all times.
It could even be a bad printer driver with a stuck print job, so maybe you should also check your print queue...