I just bought a 2003 Ford Focus with the 2.0 SOHC engine for my son and I to have as a project car. I am having trouble identifying what this part of the engine is. If you are looking at the engine, it is on the far left side of the engine under the coolant reservoir. It's appears to be on the end of the engine block and comes up. It is about 4 inches in diameter, and it looks to be rusted out but maybe it is supposed to have a cap on it or something. This is the first Focus I have owned and trying to become familiar with it. I have attached a picture to help identify, but this is not my engine. Thank you!
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