anyone know of any cars that have heater blower motors that are interchangeable with our cars. 4th gens blow much harder than our 3rd gens do, and my s10 blazer had a strong heater blower. What will bolt up there?

 

For a non-AC system:
Almost anything from an early to mid/late 80's GM will bolt in. I've used one from an 81 Impala, also an 87 Cutlass. Make sure the 'squirrel-cage' is the right depth - there's a couple different ones.
Not sure about the ones with AC, but I'd suspect they run along the same lines.

 

well i need one that will blow pretty hard. How were the ones uve used?

 

No noticeable difference to me. I haven't seen a 3rdgen yet that had what I would call a powerful blower system. The one in my old 81 T-bird, you could have used it as a hairdryer...
It must be something in the design of the ducting...