Any · Hardware

Fix a hot PC for good: the airflow pass

Dust cleaning is a band-aid. The real fix is airflow: cool air in one side, hot air out the other, with nothing blocking either.

DifficultyMedium
Time45 min
RiskLow
ReversibleYes
PlatformAny
UpdatedAug 18, 2026

Written and tested by emdottech

What that means

Low risk. This fix only checks things, or changes settings you can switch back in the same place. This change is reversible — you can return to the previous state without professional help or data loss.

A PC case airflow diagram showing cool air drawn in through front and bottom fans, hot air exhausted out the rear and top, with 5–10 cm clearance behind the case

Steps

01
- Map your case: front and bottom fans pull cool air IN (labels face out), rear and top fans push hot air OUT
02
- If you have no exhaust fan at all, add one at the rear — a single intake with zero exhaust just shuffles warm air around
03
- Keep 5–10 cm of clearance behind the case; a PC shoved against a wall re-inhales its own heat
04
- Clean the dust filters (front/bottom) every few months and route cables out of the front intake path
05
- Verify with HWiNFO64: idle CPU under 45°C and GPU under 50°C means the pass worked

How to verify the fix

HWiNFO64 shows idle CPU under 45C and GPU under 50C, with cool air in one side and hot air out the other.

If this didn't fix it

Temps stay high after the airflow pass — dust filters are blocked or a fan is failing; clean filters and test each fan.

Next stop: the related fixes below, or start a guided diagnosis.

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Fix a hot PC for good: the airflow pass

Steps

✓How to verify the fix

!If this didn't fix it

Related fixes

How to verify the fix

If this didn't fix it