PLEASE HELP - Cleaning PC Ended up in Constant Overheating of the CPU

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IntzaKing

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May 15, 2017
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Basically I moved to another house and I decided to once again clean my PC. This time I trully cleaned everything about it. Not a tiny bit of dust left it was glass new.
The good:
- PC never looked so good.
- Better overall temperatures from cleaning everything.
- Better airflow.

I have the Liqmax II liquid cooler from Enermax. 120mm fan. When I first cleaned it 4 months ago I noticed an increase in temperatures on the CPU. Now I cleaned it again. BUT, I also placed the fan on the back side of the computer to push air out. I have a fan on the front for air intake and in general any other temperature is perfect but the CPU. I own the i7 4790k, which means it overclocks itself automatically at 4.4GHz. At first when I reapplied thermal paste and reinstalled the cooler it all got crazy. Huge temperature increase and stuff. I kept reapplying more or less thermal paste to see which works best. I ended up using the vertical line technique as it is described as the best by Intel. Yet when I stress test it with OCCT or Prime95 it dies off in 5 seconds. I run the fans on Overclocked mode so they are run at 2800RPM non stop, it's fine it doens't bother me (noise wise). The system works perfectly but I don't understand why the CPU overheats immediatly.

The problem is for sure on the CPU itself, the Liquid Cooler or hopefully the cheapest option the Thermal Paste. I will go and buy a new Arctic Silver 5 and reapply the thermal paste and hope that solves the problem. But any further tips on what the problem could be are very welcome.
 
Solution
synphul
Try feeling the cooler hoses when the pc is running. They should both feel around the same temp, if one hose is significantly warmer than the other then there may be a problem. A blockage in the radiator, air bubble stuck in the pump, something with the cooler not plugged in correctly or the cooler may have potentially failed.

Can you feel warm air blowing out the back of the case from the radiator? Try lightly placing your fingertip against the waterblock over the cpu while it's running, see if you feel a slight vibration to indicate the pump is operating. Different thermal paste won't change much, most pastes vary between 1-3c so won't be the difference between a cool cpu and severely overheating one. That's more or less the result...
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synphul

synphul

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Mar 11, 2011
9,477
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Try feeling the cooler hoses when the pc is running. They should both feel around the same temp, if one hose is significantly warmer than the other then there may be a problem. A blockage in the radiator, air bubble stuck in the pump, something with the cooler not plugged in correctly or the cooler may have potentially failed.

Can you feel warm air blowing out the back of the case from the radiator? Try lightly placing your fingertip against the waterblock over the cpu while it's running, see if you feel a slight vibration to indicate the pump is operating. Different thermal paste won't change much, most pastes vary between 1-3c so won't be the difference between a cool cpu and severely overheating one. That's more or less the result of the cooler. If temps were to improve say 10c by changing thermal paste there's a better chance it was the remounting of the cooler to the cpu fixing a bad mount job.

If the cooler is properly plugged in (double check install directions) you might want to try removing the radiator from the case. Give it a few gentle shakes and then mount it back to the case. Shaking it could help work any stuck air bubbles up to the top of the radiator. If things got shifted around or jostled in the move or during the cleaning process an air bubble may have gotten stuck in the pump/block. That can cause the pump to lose its prime and instead of pushing a steady flow of fluid through the system it will hit that air pocket and stop circulating the coolant. Running it in that scenario too long can overheat and damage the pump, they usually rely on the coolant circulation to keep the pump cool.
 
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Solution
TehPenguin

TehPenguin

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May 12, 2016
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What did you exactly clean and what did you use to clean it? Have you monitored the temperatures?
Have you cleaned the CPU block of the AIO? Maybe what you used to clean it, if you did, has worsened the thermal conductivity.
 
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