Hello I have a few questions about some cars..........2004 grand dodge caravan,

87 cutlass,96 nissan sentra? 2004 grand dodge caravan......heat/air does not work in front system only in back...do i just need a front blower motor?
Cutlass-- heat/air dont work, passanger seat floor drenched in green antifreeze, hasnt overheated yet, is that the heater core?
Nissan- not sure of the year, but after 60 mph car starts shaking bad? what is that? other than that smooth sailing.
Thanks.
 
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