The dealer is gonna have to check it out then, most likely there is a fault keeping the compressor from engaging. I doubt the compressor is bad. Keep us updated.

 

Thanks for the input. I guess it's time to go to the dealer. The only problem is that I'll have to get the car detailed before I take it in.
They are very particular....

 

I have the same problem with my 2.8q right now I just refilled it secondary fan turns on AC compressor wont turn by hand. Not sure if its relay or what i jumped low end switched to kick it on for low pressure still nothing.

 

I have a 99 Audi a4, the AC is working fine when it's not so hot, but when in traffic light or slow traffic and hot climate I can feel that air is not that cold especially when the compressor disengage I can hear it disengage for 30 seconds or so which makes the air hot inside. when I went to the dealer they said it's OK... when i went to another workshop i found that the pressure get so high when I accelerate slightly, could be that a clogged evaporator?? they don't do an evaporator flush at the dealer.