Cooling/ radiator question

[Steve Kramer]

One of the nice selling points for this car over my 89 200 was the more
straightforward type of cooling system as opposed to the cooling system on
the 200.  

Having a radiator fan cooling the radiator all the time is nice on the V8.
However, I am getting the feeling that this engine is running hot.  As to
not repeat the problems I had with my other car I would like to get your
opinions.  I either think the water pump is dying or there are some sensors
that aren't doing their jobs.

Here's the diagnosis.

Car runs good. I drive on the highway to get to work. It takes me about 30
minutes 

As temperature increases - oil starts to thin down.  I find that when I get
to work my oil pressure/ bar gauge is around 1  Oil temp is at 60 and
coolant temp is just above middle line at idle.  This is all happening on a
50 degree day. 

A typical day I am driving this car at 80mph on the highway for 20 of the 30
minutes.  Driving at 80 the bar pressure is at 5 and the coolant temp is at
the middle line.

The multi function alert system says everything is fine.  No temp warning or
anything.  I have replaced the upper hose because it had developed a small
leak.  The other hoses are in good/ fair shape but no leaks.  There is no
loss in liquid at the expansion tank after I drive.

Does the V8 typically run hot?  The radiator is cooling the antifreeze
properly because the radiator feels cool to the touch.  But the engine,
hoses and coolant are very hot when I turn off the car.  I'm a little
concerned.  If not the pump are there cooling sensors that are not feeding
the proper amount of coolant through the engine.  Where are the different
sensors?


Thanks


Steve Kramer
90V8 q