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Turbo cooling, was after-run
I checked in my Bentley manual and found this:
Type MC engine/ Secondary cooling pump test
Run engine until radiator cooling fan switches ON at HIGH speed
Turn OFF engine and wait five minutes-
secondary coolant pump and radiator fan must switch ON
NOTE:
Radiator cooling fan will run on LOW speed.
If coolant pump and radiator fan DO NOT run:
Remove harness connector from secondary coolant pump thermo-switch and bridge
terminals
coolant fan and radiator fan must run
If YES
replace thermo switch
If NO
check for open circuit