Trapped air prevents radiators heating up fully, so if your radiators feel cooler at the top than at the bottom, it's likely that a bit of air has got stuck in them. Luckily - getting the air out of the radiator - "bleeding" it - is as simple as it gets. Watch this video tutorial to learn how to bleed a radiator.

Apple's iOS 26 and iPadOS 26 updates are packed with new features, and you can try them before almost everyone else. First, check Gadget Hacks' list of supported iPhone and iPad models, then follow the step-by-step guide to install the iOS/iPadOS 26 beta — no paid developer account required.
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