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Mac Pro with fan at full speed with normal temperature

I am helping a friend with a Mac Pro1,1 upgraded to 2,2

Firmware and SMC were upgraded, he change the CPU from two 2 cores to two 4 cores.

Now fan run at max. I installed Mac Fan Control and all temperature reported by the app seems ok.


I did reset the SMC by unplugging power 15 seconds, then replug and wait 10 seconds. 

No luck 

Reset PRAM even if I dont did that would help. (Waited 3 restart )


Any help would be greatly appreciated



Posted on Jan 8, 2020 10:39 AM

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Posted on Jan 8, 2020 5:53 PM

some web searches suggest TC1C and TC3C are temp sensors for CPU Dies A and B.


If true, it sounds like you guys did not get the firmware updated properly. on the About this Mac page, what Mac does it say you have (don't post your serial number, please)

9 replies

Jan 8, 2020 5:03 PM in response to BDAqua

I have started the 10 minutes timer :-)


  • I was just playing with fan speed, and at 800 temperature of memory were rising. I wanted to see were they would stabilize. He has 32 GB or ram.
  • the computer was turn off for 24 hours, when I press power, the fan ramp up, before the started chime.
  • in the Mac Fan Control App, with log enable I see two warning
WARNING: getTemperature - skipping sensor TC1C with value of 0
WARNING: getTemperature - skipping sensor TC3C with value of 0

I might tried the same app on my MacPro3,1 to see if I get some waring



[2020-01-08 19:36:07:301] [thread 1978] [app.cpp#132] Macs Fan Control 1.4.11
[2020-01-08 19:36:07:302] [thread 1978] [app.cpp#133] macOS 10.7.5
[2020-01-08 19:36:07:302] [thread 1978] [app.cpp#134] MacPro2,1
[2020-01-08 19:36:07:302] [thread 1978] [app.cpp#135] Intel(R) Xeon(R) CPU X5365 @ 3.00GHz
[2020-01-08 19:36:07:302] [thread 1978] [app.cpp#136] Qt 5.6.3
[2020-01-08 19:36:07:308] [thread 1978] [SMC/Service.cpp#77] detectSmcFanKeySize KeyType fpe2
[2020-01-08 19:36:07:308] [thread 1978] [SMC/Service.cpp#78] detectSmcFanKeySize KeyLen 2
[2020-01-08 19:36:07:485] [thread 1988] [core/FanControl.cpp#253] InitialLoadThread
[2020-01-08 19:36:07:485] [thread 1988] [core/FanControl.cpp#108] QFanControl::loadFansFromSMC
[2020-01-08 19:36:07:486] [thread 1988] [core/FanControl.cpp#114] Fans count - 4
[2020-01-08 19:36:07:487] [thread 1988] [core/FanControl.cpp#137] CPU_MEM
[2020-01-08 19:36:07:489] [thread 1988] [core/FanControl.cpp#137] IO
[2020-01-08 19:36:07:491] [thread 1988] [core/FanControl.cpp#137] EXHAUST
[2020-01-08 19:36:07:492] [thread 1988] [core/FanControl.cpp#137] PS
[2020-01-08 19:36:07:492] [thread 1988] [core/FanControl.cpp#257] InitialLoadThread - smc_get_fans_control_mode
[2020-01-08 19:36:07:493] [thread 1988] [core/FanControl.cpp#77] Fan 0 mode is auto
[2020-01-08 19:36:07:493] [thread 1988] [core/FanControl.cpp#77] Fan 1 mode is auto
[2020-01-08 19:36:07:493] [thread 1988] [core/FanControl.cpp#77] Fan 2 mode is auto
[2020-01-08 19:36:07:493] [thread 1988] [core/FanControl.cpp#77] Fan 3 mode is auto
[2020-01-08 19:36:07:493] [thread 1988] [core/FanControl.cpp#261] InitialLoadThread - QTempSensorSmart::loadAvailableSensors
[2020-01-08 19:36:07:502] [thread 1988] [core/FanControl.cpp#265] InitialLoadThread - FilterSupportedTempSensors
[2020-01-08 19:36:07:504] [thread 1988] [SMC/Service.cpp#46] getSMCKeysCount: 4278190080 255
[2020-01-08 19:36:07:548] [thread 1988] [SMC/Service.cpp#619] WARNING: getTemperature - skipping sensor TC1C with value of 0
[2020-01-08 19:36:07:548] [thread 1988] [core/TempSensorSmc.cpp#329] FilterSupportedTempSensors - skipping sensor TC1C
[2020-01-08 19:36:07:550] [thread 1988] [SMC/Service.cpp#619] WARNING: getTemperature - skipping sensor TC3C with value of 0
[2020-01-08 19:36:07:550] [thread 1988] [core/TempSensorSmc.cpp#329] FilterSupportedTempSensors - skipping sensor TC3C
[2020-01-08 19:36:07:566] [thread 1988] [core/FanControl.cpp#278] InitialLoadThread: number of supported SMC sensors: 20
[2020-01-08 19:36:07:566] [thread 1988] [core/FanControl.cpp#279] InitialLoadThread: number of supported SMART sensors: 2
[2020-01-08 19:36:07:636] [thread 1988] [SMC/Service.cpp#450] Set fans mode 1
[2020-01-08 19:36:07:702] [thread 1988] [SMC/Service.cpp#450] Set fans mode 5
[2020-01-08 19:36:08:778] [thread 1998] [SMC/Service.cpp#450] Set fans mode 5

Jan 8, 2020 4:47 PM in response to Franco Borgo

Hi Franco,


Normally don't recommend this, but if you custom set those 2 high fans to say 2000 RPM, do the Temps go up?


I guess I'd try this...


1..Shut the machine down.

2.. UNPLUG the power lead to the computer and any peripheral devices.

3.. leave it for 10 minutes.

4.. Hold power Button in for 10 seconds

5..Connect back up and reboot. 


Another thought, perhaps it's a Timing issue, does a Restart correct the situation instead of a cold startup?


Mac Pro with fan at full speed with normal temperature

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