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Water circulation pump?

I noticed an electric water pump in my 87 5kcstq and a previous owner
bypassed the pump for some reason.  My mechanic said it is to cool the turbo
after the engine is turned off.  Why would it be necessary to bypass it? and
if I let the turbo spool down for a minute or two before shut-down is it
necessary?  I will probably fix it soon, but I need to earn some more money