Oil in the Radiator, just a bit. Truck over heated at minus 10 in like 15 minutes Has a new T- stat . also has small leak in radiator. No Anti Freeze in the oil . There was only 2 1/2 Quarts of oil in the engine
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1. Thermostat. Replace with an OEM one from the dealer. 2. Radiator. Make sure it's not plugged up. 3. Radiator Cap. There cheap from the dealer and I consider them a maint. item. 4. Water pump. How many miles are on it? 5. Fan Clutch. Make sure it has some resistance
6. Temp. Sensor for the gage.Have you checked that the electric cooling fan is turning on when the
engine reaches operating temp? A faulty coolant temperature sensor will
not trigger the fan, or the fan itself or fan relay could be shot. You
might also have a head gasket leak that is not into the cylinders, so
it would overheat without causing milky oil. Another possibility is a
clogged radiator -- with 15 years on the vehicle, it's quite
possible. Have the cooling system pressure checked, and replace the
radiator cap for starters -- if the radiator cap isn't holding pressure,
overheating will occur rapidly.
Since you have a new thermostat installed and no heat and overheatingyou have one of two or a combination of problems. You either have a bad water pump or a clogged radiator. The radiator can be flow checked at a radiator shop, if it flow checks fine replace the water pump. The pump may not have play in it indicating it is bad, but the shaft inside cold be broken so that the fan turns and the pulley turns on the outside but not internally where it counts.
Be sure that the fan is moving enough air across the radiator and be sure the radiator is clear of any debris. If it is and you're sure the system is full of coolant, have the radiator rodded out or replaced. This is most likely the issue. Hope this helps, good luck!
Put in a t-stat. No thermostat can act like a bad thermostat, causing over heating, i too have a 94, it was clacking eradically, turns out it was the t-stat opening and closing about 60 times a minute, so i took it out, it got hot, put a new one in, and no more issues.