1986 El Camino (G Body) a/c has no volume.....

[BigAlBre]

I put a 85 Bonneville/GrandPrix dash in my 86 El Camino...the ac mated up to the dash ok but there is NO Volume coming through the vents. I've sealed off thwe floor outlets as well as any leaks and still no affect. I am wondering if anyone makes a high volume fan and motor to address this issue. I've had the car in several times and all the vaccum switches replaced and the evaporator removed and cleaned. I just don't think the stock blower has the necessary capacity to pump air through the system. Is there perhaps another Gbody that has a stronger unit or an after market solution...we need out a/c in Florida Thanks

[snorky]

is the fan wiring backwards?
is where the fan pulls air from blocked?
pull the fan motor and check for running speed?
does fan motor get proper voltage to operate properly?