wrote in message
ups.com...

Melandre wrote:
It takes a couple of minutes to get passed "normal temperature". Then
another minute or so to climb over 200F. Then stays hot for 1 to 3
minutes (in a few occasions a bit longer than 3 minutes), then it
drops back from well over 200F to 150F in about 3 - 5 seconds.


We can be very certain that the cooling system isn't actually dropping
in temp for over 200F to 150F in 3-5 seconds. If you're getting a
report of a condition that seems virtually impossible, one of the first
things to check is the data itself. You sending unit is almost
certainly a screw-in unit with a wire attached to it. A new one would
be very inexpensive.



In a RAW water system that has no water flow it can overheat fairly fast and
the sending unit will show the increased temp, if the water suddenly starts
flowing the sending unit gets very cool raw water running over it almost
immediately and it cools down FAST. In fresh water /heat exchanger systems
the temp of the coolant in the engine can't cool down as fast.

I'd check for a kink in the hose in the outdrive. There is a service note
on Merc outdrives about this problem.