Sounds like you have oil making it pass the PCV Valve into the air intake system and all the way into the intake manifold. I would remove and clean both intake manifold and intake piping, replace the air filter and the pcv valve and the pcv hose going from the valve cover to the air intake tube. As to why oil is in the radiator, it sounds like either a water jacket is cracked or you have a head gasket failure, if that's the case your oil is junk too.
it should be in one of the coolant lines leading up to the radiator.
the hoses leading to and from your radiator might be clogged. If you had a rusty radiator, the rust may have clogged the hoses that carry the coolant. you should check all your hoses and even flush them out.
It is the radiator warning light. Usually it indicates low radiator fluid level. I have had this come on when I have had some minor radiator leaks leading to radiator coolant level going down.
Make sure your boiler (probably in the basement) has water in the glass vial in the front of the unit. For each radiator to work the valve for that respective radiator must be open.(looks like a water knob attached to the pipe leading to the radiator.) For maximum efficiency the vent must be the right size but it was probably installed with the unit propperly.
Yes, if the radiator fan is not working, it can cause overheating of the engine. The radiator fan helps to cool down the engine by pulling air through the radiator to remove heat. Without the fan, the engine may not receive adequate cooling, leading to overheating.
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Oil in the radiator indicates a possible severe problem, where coolant could also leak into the oil. Driving an engine in this situation at all could lead to severe engine damage.
It depends on the model year, availability of parts, and general condition of the radiator. Sometimes, they can be patched, costing about $20 but other times, it could be severely damaged leading to nearly $1,000 to fix it.
(2003 Frontier) From beneath the truck, pull back the leading edge of the rubber splash guard that is below the radiator (it is held in with push pins and 1 Phillips screw). Once this is pulled back you can see the bottom of the radiator. In the center there is a plastic plug with a Phillips head. This is the drain plug. Unscrew it with a screwdriver and the radiator will start to drain.
In almost all vehicles there is a tube leading from the top of the radiator to the engine. The point where that tube meets the engine is where the thermostat is usually located.
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As you face the engine there is a large hose on the left (passenger's side) leading from the radiator to the water pump. Slide the compression clamp at the water pump down the radiator hose by squeezing the tabs with pliers. Remove the hose (catch and recycle the radiator fluid). Remove the two bolts holding the metal outlet (from which you just removed the radiator hose) onto the water pump. The thermostat is under the metal outlet.