AC 1998 lumina 3.1

Air is slightly cold, water drips from outlet tube as it should BUT it is not cold enough and the cool air feels humid not dry as it should be. It cant keep up on a sunny humid day.

tried to put in more 134a , the meter (walmart kit) was just over the blue line
(normal line) but the system did not want to suck any more in (compressor was running).

I heard to things from this site - it could be a air orfice filter clogged

Question - can any one tell me where this filter is located ?


and it could be the mixture duct work which I read may be in the drivers side wheel are?? I can seem to find that - can anyone tell me where that might be?

Thanks!!

The system may have an expansion control problem (orifice tube) or may have an evaporator restriction (debris or contamination on the outside of the coil). The only correct method to detect an expansion control problem is to compare low- and high-side pressures on an operating system at a known temperature. The charging kit you found at WalMart will not have that capability. You'll need a full-blown gauge manifold set, and likely an adapter for the high-side connector.

Unless the system has been opened and contaminated, or the compressor is failing and spewing parts and chunks into the system, or the hose you used to charge the system was not purged clean, the likelihood of a clogged orifice tube is low. Your description seems to indicate either inadequate charge level or air flow restriction over the evaporator core. The other remote possibility is leakage around the core, if the system has been disturbed or the seals/baffles around the core have failed.