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Depending on the year of year car, there is a large steel tube ( about an 1 1/4" ) that goes to the exhaust manifold for warm air while engine is cold. There is a smaller tube ( about 5/8" ) that is for crankcase ventilation, allowing for filtered air to enter the engine for expansion and contraction of the fluids and metal parts as they heat up and cool off.

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15y ago

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