Heat Sinks, Thermal Paste, and Liquid Cooling Explained (CompTIA A+ 220-1201 3.5)

The exam expects you to know what thermal interface material actually does and how AIO and custom loops differ when something goes wrong. This lesson takes you down to the contact layer: fin surface area, heat pipes, a pea-sized dot of paste spread by mounting pressure, and the cross-pattern tighten that keeps the base flat. You'll also learn why the pump should never be the highest point in the loop, and why a CPU that hits 80-90 degrees the second you power on usually still has the plastic sticker on the cooler base. Part 2 of 2. Part 1 covers the big picture of how cooling works, fans, and case airflow. Covers CompTIA A+ Core 1 (220-1201) objective 3.5: Given a scenario, install and configure motherboards, central processing units (CPUs), and add-on cards. Chapters 0:00 What the contact layer decides 0:25 Heat sink base plates, fins, and heat pipes 0:53 Even mounting pressure, orientation, and dust in fins 1:21 Why thermal paste fills microscopic gaps 1:50 Thermal pads and why thickness is critical 2:04 Applying paste: 90% isopropyl, pea dot, cross pattern 2:19 Paste mistakes: too much, reused, plastic sticker left on 2:49 How liquid cooling moves heat to a remote radiator 3:04 AIO sealed units and how they install 3:35 Custom loops: reservoir, pump, blocks, bleeding, leak testing 4:06 Radiator sizes: 240mm vs 360mm and cooling ceiling 4:21 Pump placement and air bubbles in the loop 4:37 AIO maintenance, pump RPM, noises, and lifespan 5:24 Recap: contact layer, paste discipline, pump placement Practice this objective (free, no signup): https://www.examwizardz.app/practice-test/comptia-a-plus Read the written lesson with inline questions: https://www.examwizardz.app/certifications/comptia-a-plus/articles/cooling-fans-heatsinks-tim-liquid Practice cooler installs and thermal interface questions in the browser PC-build lab, plus simulated Windows PBQs and exam-weighted mock tests: https://www.examwizardz.app Part of the Motherboards, CPUs, and System Architecture section of the ExamWizardz CompTIA A+ Core 1 (220-1201) course. Next lesson in the playlist. #CompTIA #APlus #CompTIAAPlus #CPUCooling #ThermalPaste #LiquidCooling #PCBuilding