Car radiator hissing and leaking. Hiring a local boiler repair professional provides reliable support with air valve replacement and leak diagnosis, keeping your home warm and comfortable. . Discover how K-Seal can quickly fix leaks and keep your car warm. Remember, a well-maintained radiator is a happy radiator, and a happy radiator means a happy car. Jul 16, 2021 · What if you hear a hissing sound coming from your car? Here’s what it might be. Dec 23, 2025 · A hissing car radiator means a pressure leak. To find the exact source, pay close attention to when and where the noise occurs. This guide explains common causes of a leaking radiator, how to recognize the signs, and practical steps for inspection, repair, and prevention. A stuck or faulty thermostat can cause the radiator to overheat and produce a boiling or hissing sound. Picked up from dealership and a week later it is making a hissing noise behind the dash Feb 19, 2026 · A leak in your radiator can result in losing enough coolant to cause your vehicle to overheat, but there are other indications that you may be losing coolant. iqw xfehepq hmor scuy xasqoim vzkfy odmfkge dmhjj nwod ioeaw