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You should be able to hear a sucking sound from where the line is supposed to go. Probably on the base of the carby. You can spray a little aero start around where you think the leak might be ie: carby. the aero start will be sucked into the open vacume port & the revs of the motor will change. Sorry I don't know exactly where it goes.
check for a bad vacuum line,, one thats either come off, or cracked allowing vacuum to escape,, start the motor, and spray short bursts of carb cleaner around the intake and vacuum hoses,, if the rpm's speed up,, thats where the vacuum leak is going to be,
check all the vacuum lines, and the PCV valve, get a can of carb cleaner, and while the motor is running, spray short bursts of the carb cleaner all around where vacuum lines are located, if the motor rev's up thats where your leak is going to be
The fan motor will need to be replaced. You can access it at the firewall. There will be 3 screws holding it on. The brushes inside the motor are shot and will need to be replaced. You can also hit up a junk yard. If the brushes are shorted out, then the motor will short out causing you to blow fuse.