76 Scamp A/C

Well, it's been awhile since I got it working and the front seal gave out on the compressor; I guess I know where that aluminum bushing went now. But, I went to O'reilly and bought a reman unit and put it on with a new drier. After fighting leaks at the inlet, outlet, and service ports, it seems to be working. There is something that confuses me though. Running, there is 10-15 on the low, about 200 on the high, ice under the hood, and about 60 degree air out of the vents. I don't have a cycling switch yet, but I would think that it should get much colder than that inside. Would unhooking the heater help any? I had hooked it up after the last compressor had quit just to see if it worked, so the temp before was always taken without coolant in the heater.