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Overheating

Apple MacBook

Severity: Moderate

Source: OnlyErrorCodes.com — Every error code. One place.

MacBook Overheating — How to Fix

What it means

MacBook overheating is almost always caused by a background process consuming 100% CPU.
Open Activity Monitor and sort by CPU usage — quit any process running unexpectedly high.
Spotlight indexing, antivirus, and browser tabs are common culprits.

Affected Models

  • MacBook Air (all models)
  • MacBook Pro (all models)

Common Causes

  • Background process consuming excessive CPU — Spotlight (mdworker), antivirus, browser rendering
  • Poor airflow — MacBook placed on a soft surface blocking the vents
  • Thermal paste dried out on older Intel MacBook models
  • macOS update triggering a full Spotlight reindex
  • Running GPU-intensive tasks on a MacBook Air without active cooling

How to Fix It

  1. Check CPU usage in Activity Monitor

    Open Activity Monitor (Applications > Utilities > Activity Monitor).
    Click the CPU tab and sort by % CPU descending.
    Find any process using more than 50% CPU unexpectedly.
    mds and mdworker are Spotlight indexing processes — they calm down on their own after a few hours.
    For other rogue processes, force quit them and investigate if they are needed.

  2. Use on a hard flat surface

    MacBooks vent heat through the hinge area and underside.
    Using a MacBook on a bed, pillow, or soft surface blocks vents and causes rapid overheating.
    Use on a hard flat surface, or get a laptop stand with raised airflow.

  3. Wait for Spotlight to finish indexing

    After a fresh macOS install, migration, or update, Spotlight reindexes the entire drive.
    This can cause heavy CPU load and heat for several hours.
    The process completes on its own — avoid adding more workload during indexing.

  4. Reset SMC (Intel Macs)

    A corrupted SMC can cause fans not to run at the right speed.
    Shut down the Mac.
    Hold Shift+Control+Option+Power for 10 seconds, then start normally.
    On M-series Macs, the SMC equivalent is handled automatically — simply restart.

  5. Older MacBooks — clean vents and check thermal paste

    Intel MacBook Pros accumulate dust in the fan and heatsink fins over time.
    Use a can of compressed air to blow out dust through the vents.
    If the MacBook is 4+ years old and still overheating after cleaning, the thermal paste may need replacing — this requires opening the machine.