I bought my 1989 535i from a second owner who himself never drove it because it was bought on another person's behalf who changed his mind.
I am letting you all know this because other from carfax I do not know the history of the car. now on to my situation....
I noticed a sticker that the A/C system was converted to r134a back in 2000. but the compressor was not turning on. I bought a cheap r134a recharge kit and the compressor did turn on. BTW i checked before and there was nothing in the lines. The air is not cold, it is bearly cool after the recharge. And the AUX fan does not turn on. I suspect it also did not turn on today while sitting in traffic on the freeway in 90+ weather. At that time I noticed the temp slowly creaping up from the 1/2 mark so I turned on the heat full blast and it went back to normal.
I asked a shop and they told me the compressor is weak/failing and needs to be changed.
now I do not have a problem with buying a compressor, I just do not know if the previous owner used the original or an r134a compatable one.
and more importantly: why isn't the AUX fan not turning on??? I changed all the fuses for the A/C system and AUX fan and still, nothing.