Why your laptop keeps overheating
Short answer: Laptop overheating is almost always caused by blocked airflow. Dust builds up inside the heatsink fins over 6–12 months of use, and the thermal paste (the heat-conducting compound between the CPU/GPU chip and the metal heatsink) dries out and cracks. Together these two factors prevent heat from escaping, and the chip temperatures climb until the laptop throttles or shuts down. Both problems are fixed in one service visit.
How to diagnose and fix an overheating laptop
Step 1: Confirm it is actually overheating, not just warm
All laptops generate heat — that is normal. Overheating is when the CPU or GPU (the main processor chips) crosses a temperature at which the laptop reduces its own speed or switches off to protect itself. You can check chip temperature for free using HWMonitor (Windows) or iStatMenus (Mac). If your CPU is consistently above 90°C under normal load like video calls or document editing, you have an overheating problem. Signs that confirm it: the fan runs at full speed constantly, the bottom of the chassis feels painfully hot, the laptop is noticeably slower than it used to be, or it shuts down without warning during use. Read more about sudden auto-shutdowns if that is happening alongside the heat.
Step 2: Check for blocked vents and poor airflow
Look at the side and rear vents of your laptop. If you see grey or dark lint visible at the vent grille, air is no longer moving through the heatsink fins freely. Using compressed air to blow through the vent can dislodge some surface lint, but for most laptops it only clears the outer layer. The dense dust mat that forms inside the heatsink — pressing against the fan blades and packing the fin gaps — requires opening the chassis to remove properly. Also check where you use the laptop: soft surfaces like beds, sofas, and laps cover the base vents and can raise temperatures by 10–15°C on their own. A flat hard surface or a simple laptop stand immediately helps the airflow.
Step 3: Thermal paste — the component people forget
The thermal paste (sometimes called thermal compound or TIM — thermal interface material) is a thin layer of grey paste applied between the CPU/GPU chip and the copper heatsink that sits on top of it. It fills the microscopic air gaps between the two surfaces and conducts heat from the chip into the metal. New thermal paste is efficient and pliable. After 2–3 years of heating and cooling cycles, it dries out, cracks, or separates — and those microscopic air gaps return. When that happens, the chip can run 20–30°C hotter than it should even with a perfectly clean fan. Thermal paste replacement is always done alongside a heatsink clean, because the job requires opening the laptop to the same depth anyway. Visit the laptop overheating repair service page to book this service at your door.
On recent M-series MacBooks (M1, M2, M3, M4), Apple uses a vapour-chamber cooling system rather than traditional heatsink + paste, so the thermal maintenance process is different — but the principle of keeping the vapour chamber clean and unobstructed applies.
Step 4: The India angle — summer heat cooks unmaintained laptops faster
In most Indian cities, summer ambient temperatures sit between 38–42°C from April through June. A laptop's cooling system is designed to exhaust heat at a temperature differential relative to the room air. When the room itself is already 40°C, an unmaintained laptop that struggles at 25°C now hits critical chip temperatures within minutes. We see a sharp spike in overheating repair bookings every April as temperatures rise. In high-pollution metros like Delhi, Mumbai, and Bengaluru, fine particulate matter halves the interval between cleans compared to cleaner-air cities. If you live near a construction site or a busy road, 6-monthly cleaning is the right target. An unmaintained laptop in a hot Indian summer does not just throttle — it can develop hairline solder cracks around the GPU or CPU die from repeated thermal stress cycles, which are far more expensive to fix. The internal cleaning guide covers exactly what the service involves. Also worth checking: a faulty or slow-running cooling fan makes overheating dramatically worse — the fan is the pump that moves air through the heatsink.
When to call a laptop repair service (and what it costs in India)
When DIY ends
Stop and call a professional if: temperatures remain above 90°C even after clearing visible vent lint; the fan makes a grinding or rattling noise (a bearing is failing); the laptop shuts down within minutes of powering on; you have already replaced thermal paste but temperatures have not dropped; or the base panel is deforming from internal heat buildup. These signs point to a failed fan, a damaged heatsink, or a GPU with compromised solder joints — none of which are safe to attempt at home without the right tools.
Typical repair cost in India
Internal cleaning plus thermal paste replacement: ₹900–₹1,500. Cooling fan replacement (if the fan has seized or its blades are cracked): ₹800–₹2,000 depending on the fan part. Heatsink replacement (bent or corroded copper pipe): ₹1,500–₹3,500. GPU solder reflow (if the chip has developed cold joints from thermal stress): ₹2,500–₹5,000. A ₹149 doorstep visit includes a full thermal diagnosis — you get an exact quote before any work begins.
A note from the LRW Engineer Team
The most common mistake we see is customers buying cooling pads and external fans thinking that will solve the problem. Those accessories help marginally but they do not fix a clogged heatsink or cracked thermal paste. The heat is being generated inside the chassis and cannot escape — blowing more air at the outside of a sealed system barely moves the needle. The fix is always internal. We see this pattern monthly: a customer spends ₹800 on a cooling pad, the laptop still overheats, and then they come to us for the ₹1,200 internal clean that actually solves it. Do the internal clean first — it is the cheapest and most effective fix.