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How many fans on a 27" iMac (Late '12)?

Control fans on Apple hardware: iMacs, Macbooks, etc

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OrieltonJohn
Posts: 2
Joined: 07 Mar 2016, 00:32

How many fans on a 27" iMac (Late '12)?

Post by OrieltonJohn »

I am having problems with unexpected shutdowns on a late 2012 27" iMac running El Capitan which I suspect are heat related.

I installed Macs Fan Control because the fan did not seem to be spooling up when the machine started to heat up (constant 1200 RMP). MFC seems to work perfectly, but increasing the fan speed does not seem to be having a large impact on the GPU temperature (which seems to be my problem).

I was surprised that my machine is only showing one fan. I can't find an authoritative source, but it appears that most iMacs have 3 fans. Can anyone confirm whether this is the case?

Thanks for the help.
Screen Shot 2016-03-07 at 11.35.02 AM.png
Screen Shot 2016-03-07 at 11.35.02 AM.png (49.47 KiB) Viewed 5357 times
MFC Technical data:

Macs Fan Control 1.3.3
iMac13,2
Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz[100]
Mac OS X Unknown

Fans:
Main-min{1200}curr{1198}max{2640}mode{2,TG0D,60,80}


TempSensors:
TA0P () - 16.125, 16.125
TA0V () - 23.8086, 23.8086
TA0p () - 36.125, 36.125
TC0E () - -1, 214.074
TC0F () - -1, 215.605
TC0J () - 1.53125, 1.53125
TC0P (CPU Proximity) - 57.75, 57.75
TC0T () - -1, 255.914
TC0c () - 57, 57
TC0p () - 57.75, 57.75
TC1c () - 57, 57
TC2c () - 58, 58
TC3c () - 58, 58
TCGc () - 57, 57
TCSc () - 56, 56
TCXR () - -1, 210.125
TCXc () - 59.125, 59.125
TCXr () - -1, 210.125
TG0D (GPU Diode) - 57, 57
TG0E () - 61.0039, 61.0039
TG0F () - 61.582, 61.582
TG0J () - 0.578125, 0.578125
TG0T () - -1, 255.855
TG0d () - 48, 48
TG0p () - 54.25, 54.25
TH0A () - -1, 129
TH0B () - -1, 129
TH0C () - -1, 129
TH0F () - -1, 129
TH0O () - 1, 1
TH0P () - 1, 1
TH0R () - -1, 129
TH0a () - -1, 129
TH0b () - -1, 129
TH0c () - -1, 129
TH0e () - -1, 0
TH1A () - 36.125, 36.125
TH1B () - 38.125, 38.125
TH1C () - -1, 129
TH1F () - -1, 209.57
TH1O () - 9, 9
TH1P () - -1, 129
TH1R () - -1, 210.125
TH1a () - 36.125, 36.125
TH1b () - 38.125, 38.125
TH1c () - -1, 129
TL0P () - 23.3945, 23.3945
TL0V () - 35.793, 35.793
TL0p (LCD proximity) - 37.625, 37.625
TL1P () - 38.5625, 38.5625
TL1V () - 33.8477, 33.8477
TL1p () - 38.5625, 38.5625
TL1v () - 33.8477, 33.8477
TM0P () - 43.5, 43.5
TM0V () - 53.8125, 53.8125
TM0p () - 43.5, 43.5
TM1P () - 36, 36
TM1a () - 56.6016, 56.6016
TM1p () - 36, 36
TM2P () - 39.875, 39.875
TM2a () - 53.8125, 53.8125
TM2b () - 58.3125, 58.3125
TM2c () - 53.3125, 53.3125
TM2d () - 58.3125, 58.3125
TM2p () - 39.875, 39.875
TM3P () - 40.5, 40.5
TM3a () - 51.9297, 51.9297
TM3b () - 52.1172, 52.1172
TM3c () - 51.9336, 51.9336
TM3d () - 55.0938, 55.0938
TM3p () - 40.5, 40.5
TM4a () - 51.582, 51.582
TMXP () - 43.5, 43.5
TPCD () - 50, 50
TS0V () - 40.8086, 40.8086
Tb0P () - 46.25, 46.25
Tb0p () - 46.25, 46.25
Tm0P (Mem Controller) - 45.875, 45.875
Tm0p () - 45.875, 45.875
Tm1P () - 47.375, 47.375
Tm1p () - 47.375, 47.375
Tp2F () - 37.3945, 37.3945
Tp2H () - 37.25, 37.25
Tp2h () - 37.25, 37.25


Disk drives:
APPLE SSD SM128E - 38
APPLE HDD WDC WD10EALX-408EA0 - 43
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Steven
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Posts: 2294
Joined: 21 Dec 2009, 11:48
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Re: How many fans on a 27" iMac (Late '12)?

Post by Steven »

OrieltonJohn
It's 100% that this iMac model has only one fan.
OrieltonJohn
Posts: 2
Joined: 07 Mar 2016, 00:32

Re: How many fans on a 27" iMac (Late '12)?

Post by OrieltonJohn »

Thanks for the response.

By the way MFC seems to be fixing my problem. I haven't had a crash since linking MFC to the CPU Proximity sensor with a range of 40-60C. It has only been a day and a bit, but it is looking promising.

Thanks again.
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