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In this video, we will take a detailed look at the cause of the thermostat failure on the Opel Astra K with a 1.5 diesel engine. You will learn how to diagnose the problem, what symptoms indicate a faulty thermostat and what needs to be done to replace it. I will show a step-by-step repair guide, including the necessary tools and safety tips. If you are faced with engine overheating or other problems related to the cooling system, this video will help you understand the situation and restore the functionality of your car. Do not forget to subscribe to the channel so as not to miss new videos about car repair and maintenance! The size of the thermostat flap shaft seal is 6 * 14.5 * 4 Photo of the seal at the end of the video (reinforced with a spring)