Clean unnecessary background to see if it reduces fan noise. Press the Ctrl + Shift + Esc to open Task Manager. Click on More Details if the Task Manager shows a list of running applications without its details. Click on the process that’s taking a lot of CPU resources and click on End task.
The best way to check this is to turn off and unplug your computer, then open the side panel. Look at the metal heatsinks on the graphics card and CPU and see if they've collected dust. It's also good to check the intake vents at the front of the PC to see if any dust filters are clogged. If so, use a can of compressed air to clean them out.
6. Hissing/Sizzling. If you hear a sizzling or popping sound immediately after shutting down the engine, there could be a leak. Either oil or coolant is leaking onto a hot engine component. You might see the leak on the exhaust manifold, or it could be harder to find. It could also just be a vacuum line. AIOs make noise, usually in an Aurora you'd expect it to be drowned out by a fan. Note that there is a 120mm fan above the AIO cooler, in addition to the one in front of the PC. So there are two fans humming along. It could be the top fan making the noise. RobertPBham. Unless . . . have you determined if they are steam radiators (one pipe, coming in) or hot water radiators (two pipes: one coming in, another coming out). I think this is why the behavior is so strange to me. I've only had hot water radiators before, and looking now see that these must be steam radiators.

Finally, your radiator noise could be due to the drain valve being open. The drain valve is often opposite the valve for adjusting the radiator temperature, or sometimes next to it for heated towel rails. Try closing the valve by turning the cap, and it if was open this should now stop any whistling noise from your radiator if this wast the cause.

Expansion noises can be extremely difficult to find, never mind fix. The suggestion to see when the noise occurs in relation to when steam hits the radiator is excellent, and should help you locate where they are coming from. If they are in the feed pipe, make sure that the pipe isn't touching wood anywhere (if it is, try slipping a piece of
Kettling can be a serious problem that should be looked at by a gas safe engineer, but common causes include: Limescale build-up. Boiler overheating or faulty. The most common reason your boiler is making rattling sounds is there are loose bolts in your boiler. But these unusual noises can mean other things.
While most New Yorkers might think the hissing, clanking, and banging come with the territory of living in the city, “these noises are not normal, and radiators are not meant to make those noises,” Shala says. “People get immune to it,” Hershkowitz adds. “But just because you’re not paying for heat or the building’s pipes, if you a6iY.
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    • is it normal for radiators to make noise