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After-Run Water Pump for Turbo

I checked the after-run pump on my 87 5kCSTQ per Bentley: I
closed the circuit at the after-run temp sensor (just above the
multifunction sensor), but only the fan came on.  No pump.  No
power even went to the water pump.  The wiring diagram seems
to indicate that the after-run relay triggers both the fan and pump.
 So, I suspect either (1) a break in the wiring going to the pump
or (2) there's another sensor/relay that I'm not finding to trigger
the pump.

Any experience or ideas would be welcome.  I hope I haven't
been cooking the turbo. :(