SearchAsk us anythingarrow rightHow do you fix a whistling radiator?If you want to stop the whistling, you have to turn the valves anticlockwise. Sometimes the water flow rate is too high or too low.Let's Get It Fixed!Our virtual experts can diagnose your issue (for free!) and resolve simple problems.Chat with a live expertChat nowCall 1 (855) 466-3948Call nowRATESHARECopy linkTwitterFacebookmagnifying glassLink copied to clipboard.SUBMIT AN ANSWERShop Recommended ProductsShop HomeX Recommended ProductsRELATED QUESTIONSHow do you stop a coolant leak?The K-Seal bottle has a cooling capacity of 20 quarts. Shake it, pour it and go. It fixes leaks and cracks in everything from the head gasket to the engine blocks.Will Stop Leak fix a radiator?The Bar's Leaks Block Seal Liquid Copper Intake & Radiator Stop Leak can be used to repair larger leak seals. This product fixes leaks and also stays in the cooling system to prevent further leaks in the future.Can you replace radiator valve?When you don't experience any other problems with your plumbing, a single radiator failing to heat up is a sign that you need to change a radiator valve. There are a few checks that you can do to make sure the problem is not with the valve.What causes a hole in the radiator?It is the most common cause of the problem. The rust and debris collected by the hoses and connections can cause holes in the radiators. Weak coolant can cause overheating in a few instances.Why is my radiator valve leaking?When the packing within the valve starts to wear out, there is a chance of a leaking valve. When the valve is in a'mid-open' position, the leak will stop when you close the valve.How do you increase radiator flow?Start by fully opening the valves on every radiator, by turning them anti-clockwise. If you want to make a list of the radiators, turn the central heating on. The people closest to the boiler heat up first.