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Original post by: Jack Byrnes ,

Title:

Why are the fans running at full speed?

Text:

The fans on my 17" Macbook Pro are running at full speed regardless of the temperature of the computer.  Even if I turn on the computer when it is stone cold the fans almost immediately start racing.

When I look at the CPU temperature sensor I see massive fluctuations in the readings.  Within a 5 second timeframe the temperature will jump from 210 to 180 to 196 then back to something in the 200s.

Any suggestions?

Device:

MacBook Pro 17" Models A1151 A1212 A1229 and A1261

Status:

open