Factory ac system. Low pressure line freezing. Refrigerant is at proper level???? Also is there any easy way to increase the ac / heat fan speed??

Too many voltage drops to fan, I added a relay to supply battery voltage directly to fan motor.
Downside is I only have high speed now, but living in FL it's what I needed.
Duct work on these cars is terrible too, might need to get under the dash and start taping up the joints.

Has the blower motor been replaced? My experience is that the secondary market blowers do not work nearly as well as the OEM blower. I hope there is one out there that does work but I have not found it yet after three tries. For me, A/C and Defrost do not have the output needed to do the job. Using a relay is about the only alternative since max output with the newer motors is the equivalent of medium on the OEM blower.
Craig

Not cheap but if you still have the old one you could send it out for exchange for one that has been restored.
http://www.bmcuda.com/products.asp?cat=10

What type of relay do l need? How did you wire it up???

A simple Bosche style is the easiest to find.
http://www.ebay.com/itm/Car-Truck-Auto-A...c54&vxp=mtr
One similar to this. Found in just about any auto parts store with a socket as well.
Craig

If the low side is freezing, it's probably a restriction or TXV. Need to know what your pressures are. With the gauges does the low side pressure try to pull down to zero or even a vacuum before cycling?

For the fan, try and adapt a late model Caravan dual blade fan. Those move a monstrous amount of air. Spinning the old fan faster is going to have limited results. And get a OE fan! The aftermarkets have really bad blade designs and don't move much air but make lots of noise!