Desktop CPU Cooling System: dust blockage. A dense mat prevents air passing through the fins even while the fan spins.

The distinguishing clue

Fan speed rises but exhaust airflow remains weak.

Checks before an assessment

Note whether temperature rises quickly after startup or only under sustained CPU work. Keep the case closed and avoid load tests if the cooler may be loose or the pump has stopped.

Stop point: A loose cooler can allow unsafe temperature rise within seconds.

Workshop confirmation and repair

Device-level check: Compare pump or fan speed, cooler mounting, case airflow and processor power under a controlled test.

Targeted check: Inspect the full air path rather than cleaning only visible vents. If confirmed: Remove debris safely and verify that fins and shrouds are clear.

Repair boundary: Repair the confirmed fan, pump, mounting, compound or airflow fault before extended load.

Related cause to rule out

When rattling, scraping or delayed fan startup changes with orientation, also consider Desktop CPU Cooling System: worn fan bearing before choosing a repair.

Checks after the work

After repair or replacement, check idle, processor stress, fan or pump speed and cooldown.

For an AEPC repair assessment in East Auckland, provide the exact model and observed clue. Call 027 908 8880 before visiting the Burswood workshop.