This is basically what TURBO TIMERS used to do.
I have not bothered in a long time as modern turbo engines have come along way. I know after I drive my wife's Saab it kicks on the fan after the car has been shut off automatically.
'98 Dinan/RMS stage 2+(VAC cams, CES Cutring etc)
'11 Saab 9-3 XWD tuned(wife)
'06 Saab 9-5 Combi 5mt tuned(Aero interior/Konis etc)