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ok, its time for a radiator flush. there is major sludge in the internals of this radiator. Make sure the thermostat is in the correct position as well. I've seen many cars come into my shop with the thermostatinsertedbackwards.
Does it overheat sitting still for 10 minutes? or just when driving? If it is sitting still and all of the above is true then one of the above is not true My money would be on the fan.
By the Radiator fan runs perfectly do you mean it spins? if the clutch is worn then you can have overheating issues when it is sitting still or while driving.
The gentleman who told you it couldn't be the head gasket is truthful. If the radiator build enough pressure up while it was hot to blow off the radiator hose then the gasket is sealed or it would of just flooded the block instead.
Things to check
Is the air deflector and the fan molding still on the vehicle? it is amazing how much of a difference these make on the older long nosed vehicles. IF the answer is no you need to find the fan molding and put it on or get the bottom air deflector replaced or fixed as this is where a majority of the fresh air is going to come from.
Is the thermostat placed in the vehicle properly? Yes almost seems like a trivial problem but it is possible to put in backwards and depending on the thermostat can cause problems
Did you put an OEM water pump in the vehicle? If not did it get put in the car going the correct direction? OEM pumps have flat blades meaning it does not matter the direction Most aftermarket have curved ones causing the water pump to not function properly.
If the pump was installed properly was the Serpentine belt placed properly?
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Oil coming out of the exhaust is an indication of valve stem seals are gone.What engine is in your van?You will need a reconditioned head or you could do the seals yourself as the whole kit comes with all the required seals.
This is a complex job. You could try and get the Hanyes manual. Because, if you make a bad adjustment, the engine is totalled!
In the meantime, you put in a new timing-belt, water-pump, and torque the head. The Crank-pulley and the cam-sproket must be lined up in proper positions. That's why you need a good manual.
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