AC question

[jsbihn]

Ok so I just picked up my truck from getting the AC fixed. Here is the run down
New compressor
New Dryer
New tube
new freon
New Belts
ac was flushed

I get in the truck and turn it on, and it blows cool
not cold... cool

So I am thinking it might be the air from the outside but it is a little cooler then that.
Then I drive it a little, it gets colder... but definitely not like it did before the compressor went out.

Ok, now I drive it around 50 for a few minutes and it starts to get colder. Definitely is working but it seems that ever time I slow down or something the AC doesnt blow fridgid like it did prior to the compressor going out.

I am wondering if there could be an air bubble in the system
does that stop it from cooling
Or could there be a leak or something?

Given it was night time out when I tested this and tomorrow I am driving it in the heat
I am just wondering what you guys might think is going on