if this vehicle is automatic,the most likely cause would be the transmission fluid cooler. it is a tank inside the radiator that cools the transmission fluid. if by any reason the tank leaks it would contaminate your water/coolant/antifreeze. answer a cracked head will allow oil into water jacket in head, going from there thru to radiator if it was a bad head gasket, u would have water in oil instead
I would have to guess that your radiator has a hole in it. Look andd see if your transmission lines go to a tank on the radiator. If this is the case then the radiator will have to be replaced. You transmission line is leaking oil into the coolant. Is there also coolant in the transmission? This is the only way that I can see this happening. Now if you were just having coolant in the transmission then I would say that there was a head gasket issue. well I hope this helps you.
You may have a blown head gasket. Have it pressure tested. The head gasket keeps the cylinder head sealed from the water that circulates through the heads to keep them cool. If the gasket gets a hole in it, then there is a gap in which oil can get into your coolant. Make sure what you are seeing is OIL in the coolant first.
Pressurized oil lines go from the block through to the head. If the head gasket is leaking at that point and allowing a small amount of pressurized oil to seep between the line and the coolant jacket you could get oil in the radiator. Another possibility is that perhaps someone used water pump lubricant which is nothing more than an emulsified oil (oil blended with water). Over time the oil can separate from the coolant and that might be all you're seeing, especially if it isn't much oil. If it's RED oil it could be comming from the transmission cooler line. That runs through one of the radiator tanks and if the transmission line is leaking you could certainly get oil in the radiator... but it' would be red.
Radiator, radiator cap, radiator hoses, water pump, coolant reservior and heater core are the more obvious areas. If you notice coolant in your oil it can be caused by a blown head gasket or damaged coolant sleeve in the head of the enging. If you cannot see any coolant leaks outside of the vehicle, check the floor mats on the interior. If you find coolant there, it more than likely is a heater core.
Without any other info I'd say you have a bad headgasket or a cracked head/block. Generally oil has to be pressurized to show up in coolant, or the reverse would be true and you'd have coolant in the oil also making it milky white. So... oil is leaking from somewhere pressurized to coolant.. Pressurized oil only comes up to the head in one passage, and that has likely developed a leak to the nearest coolant passage, most likely through a bad head gasket. This is more likely if it's been recently overheated. Some vehicles have an internal oil cooler located in the radiator. If this cooler has a leak then you will get oil in your radiator. If the fluid inside the radiator is a pinkish, reddish color the it would be the internal transmission dooler in the radiator
You did not say what you are working on, YEAR AND ENGINE SIZE. But in most cases or designs the water pump can not leak oil into the coolant. The water pump has nothing to do with the engine oil. Does the engine have a engine oil cooler on it ? That would be 2 oil lines just above the oil filter that runs down the side of the engine oil pan a go to the radiator. There are tubes inside of the radiator that oil flows through and they are none to leak oil into the engine coolant that's inside of the RADIATOR. If they are leaking then REPLACE RADIATOR. BUT like I said I don't know what you are working on. Would like to help you with your problem, But need more INFO. NEUTZ.
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