It could be that your thermostat isn't fully opening when the engine is warm.
Friend, you don't just clear the outside of the radiator of debris that hampers air flow, you also must clear anything hampering fluid flow. Backflushing the radiator may take care of your situation. Take the lower hose off the water pump and connect a garden hose to it. Disconnect the upper hose from the engine and direct it towards the ground and turn the garden hose on to do this backflush for 15 or 20 minutes and it should clear the radiator. by forcing most if not all foreign material from the core.
SOURCE: oil cooler lines
the oil cooler lines connect to the tank portion of the radiator there should be one port on top and one port towards the bottom the ports should be no more than 3/8 inches in diameter
SOURCE: oil cooler line
There should be two tranny lines going into the radiator. That means there should be a total of 6 hoses going into the radiator.
Hope it helps.
SOURCE: My Volvo is overheating and mixes the engine oil
the oil that you are seeing may be transmission fluid if its an automatic,the transmission lines go through the radiator for cooling.if the radiator fails in that section ,it could be leaking into the antifreze,or you have a blown head gasket
SOURCE: does my 1997 blazer 4.3 radiator have a oil
Look on engine side of the radiator, you will have two line's going into the radiator at each end one end will be transmission line's and at the other end will be oil cooler line's if you only have them at one end only then no oil cooler.Hope this was very helpful.
Testimonial: "they had both"
SOURCE: 99 suburban leaking from oil cooler fitting on radiator
It sounds like you might have a crack in the plastic tank of the radiator. If the line was leaking, I would think you'd see some oil leaking. Any anti-freeze leaking? When the truck is cooled down, I'd check the anti-freeze and oil level.
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