I have an '84 380SE. I was trying to use the climate control the other day but whether at "Min", "Max", or any temperature between, the air blowing out of the vents seemed to be the same: roughly the outside temperature.

The fans were blowing and when I had it on "Min" temp it seemed to have high fan speed on, then after switching temp to "Max" temp the fan speed slowed down to a very low speed. So, I know in at least some way the temperature wheel is doing something, just not changing the temperature. (I had it on auto fan speed, but also tried min and max fan speed and the air temp seemed the same.)

The AC was previously retrofitted to 134a and had been working. The AC compressor was engaged when I put it on "Min" setting but none of the tubes were getting cold so I suspect the AC unit is not working properly. I'm not surprised about this because recently I believe all freon was lost when the engine of the car was taken out for repairs. I had put some freon back in with a recharge kit but probably not enough.

Anyways, right now I am more concerned about why hot air was not blowing. I am not going to worry about the AC problem unless evacuating the AC lines, to get rid of any air that got in, and then refilling with freon doesn't fix it. Can anyone suggest the likely culprits of this problem?

Thanks in advance for any suggestions.