I have a 2001 Dodge Intrepsid ES, and have had a/c serviced and after a few days it would blow off the presure valve on compresser a couple of time for a second or two, but afterware it seems to work ok except for when going slow or stoped,.. and I noticed that my fans don't come on until the engine temp readhes about 1/3 the way on the gage. I am not sure but I thought that the fan would run fulltime when a/c was turned on, but this only run when needed for motor, then turns off. So I was wondering if this is why my a/c doesn't work well at slow speeds and when stoped,.. and even if you speed up RPMs on motor, it doesn't help, car has to be moving before air get cool again. Any info on what switch or sencer I need to replace to fix this would be appreciated...

your radiator fan only turns on when your temp sensor tells it that the water temp in the engine has reached a certain temperature, has nothing to do with the ac. your ac works better when you drive because your serpantine belt is connected to the all of your pullies one to which i cant remember the name of, has the ac's clutch that engages when you turn on your ac and since the faster the engine revs the faster that clutch will spin and spit out your coolant. if its not as cool you might be low on the coolant. go to oreilly or autozone and get a can of r 134 a (7 dollars) and a pressure gage (price varies relatively cheap) get your manual and find your low pressure port (the port that the gauge will fit on) which is normally located next to or on top of the compressor should be labled with "L" on the left hand side towards the fire wall. turn on your car turn your ac on highest level and connect to port and open valve on the gauge until the needle is in the blue zone average pressure around 25psi. judging on the year it might be close to being empty so it might take one can of r134a and it should run cold for you again.

Well see that was what I tried to explain, ... I also figured that if you rased the RPMs, which would spin pulley on compress faster, then it would help,.. however, as I said, if I do increase RPMs, it doesn't help, the car has to move, and after car gets moving over 10+ mph, the air works ok again,... but at very slow speeds, and at a stop, air will stop getting cool, and if you set still for a few min, then you get only hot air from it, even if you give it more RPMs, but soon are you take off and gain speed, then air gets back cold in a couple min, so that is why I was thinking about the Condenser not getting cool enough at low speed when fan is off.,.