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Hello opel astra türkiyem family, We all know the yellow cap on the water expansion tank belonging to our car. So what do we know about its function? What happens if it is broken? How much do we need to tighten it? How many bars of pressure does the cap have? I think we should create a collective video from the questions asked under the comments so that we can be aware of this yellow cap. I answered these questions and more in the video we prepared today. You can benefit by watching. #opelastratürkiyem #birlikteelele #opelastrag - This is the face link of our group, friends. When you share this link, friends who want to join our group can find our page directly. / opelastraturkiyem