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This is the heater valve. It's Motocraft part# YG350:


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Coolant coming out of the overflow is a sign of over-pressurisation. The cheapest cause of this is the pressure cap failing - have you replaced that? The other main causes of it are overheating, or gas getting into the system and so increasing the pressure, usually through a head gasket breach between a cylinder and the water jacket. Have you noticed any ...


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You have to be sure what the substance is, in your coolant. How are you determining that it is oil and not transmission fluid? They often get confused by people. A good way to be sure is to check the levels of the transmission fluid and oil, depending on the leakage, usually the low level one is leaking. If you are absolutely sure it is indeed engine oil, ...


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It's not unusual for a second radiator to be present behind the main radiator, often to cool the transmission fluid. If these fluids are mixing (water and transmission fluid), then both radiators have been damaged and are leaking their fluids together. Both radiators will need to be removed and repaired. Sometimes coolant will appear in engine oil because ...


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I take it from the wording, English is not your first language. To answer you outright, there is no reason to mix coolant and oil, under no situation where a vehicle is concerned. If you are actually asking why oil would be fed through something containing coolant (radiator or such), the reason would be simple in that it is cooling the oil. By cooling the ...



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