Ac performance ???

[34s2104]

lets start from beginning.

my car is a maroon 96 318ti

i bought this car during winter so i wasnt able to check the performance of the ac but it was working.

Cars performance was very poor due to maintenance
after a few steps (oil, filters, spark plugs,muffler changed) it was ok.

then with the summer i realised my ac is poor too.

lets give some examples

when i start my car under the sun, ac starts working but if i dont drive it it never blows enough cold air after i start driving in a minute its ice cold(not the car it only blows icy cold) after 10 minutes its very nice to be in the car.lets say i stopped somewhere and kept the car running, in a minute it is same again not enough cold.

after realising these i decided to measure the temperature.
when i start it under sun light outside temperature 85 f degrees it blows 55 f degrees at maximum.

after driving continiuously 10 minutes it blows close to 48 f degrees

after stopping the car it goes up to 52 f degrees

now does anyone know that is it normal for a ti ?