G5, fans not speeding up

plodkiller

macrumors newbie
Original poster
Jan 5, 2009
13
0
I have a Powermac G5 dual core 2.3. 4gb ram OSX Leopard installed. When I purchased it I gave it a good going over with compressed air to get rid of the dust bunnies. I also ran the apple diagnostic disc for the machine and did a thermal calibration which appeared to run correctly. I now find the CPU temp according to Temperature Monitor for Mac sometime reaching as high as 70C. The fans on the machine do not appear to be speeding up to compensate for this. Is there a way of manually speeding up the fans or will a PMU or some other kind of reset remedy the problem?

Any assistance would be appreciated
 

thekev

macrumors 604
Aug 5, 2010
6,782
2,067
Unfortunately there's no way of doing this. The G5 systems do start to hiccup a bit toward that temperature, but there's really no way to adjust it. The temperatures you mentioned should not in any way damage the system as they are within spec.
 

plodkiller

macrumors newbie
Original poster
Jan 5, 2009
13
0
Thx for the info.....do you have any idea what would be a harmful temp for the cpu?
 

reddrag0n

macrumors 6502
Oct 1, 2007
331
27
Canada
My DP 2.5 aircooled idles around 45 to 50 Celsius, but the highest i have ever seen is one cpu reach 90 Celsius, while the second one only hit 84 Celsius. That was ripping videos using handbrake. Only reason for the temp difference between cpu's is one of the heatsinks is copper and the other is aluminum.
 

plodkiller

macrumors newbie
Original poster
Jan 5, 2009
13
0
When my machine is just idling it is between 35C and 40C, I was just worried when the temps shot up and the fans didn't kick in. When I ran the thermal calibration routine I thought it was going to take off it was so loud. Any other time it is perfectly silent
 
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