The air conditioning on my Honda Pilot 2008 does not cool. It only blows warm air. Help.

Before you replace the most expensive part,how about following a diagnostic procedure. Read this post
AC blows warm air how to diagnose and fix Ricks Free Auto Repair Advice

Philip, You may have to have a good tech, check,diagnose and estimate repair. Could be a few things causing poor AC, recheck your charge level,check your fan at the condenser, make sure the condenser isn't obstructed, compressor clutch could be faulty, system could be plugged with contaminates limiting refrigerant flow.You say the system has been recharged, was it done properly, if not system could be plugged. AC system should of had system checked for leaks,evacuated, flushed, new orifice tube, then recharged with proper quantities of oil and refrigerant. Check the attached links,instruction and guides, Good luck
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try charging your ac system

have the code pulled from the pcm(computer) as there should be a code in it that can help knowing were to start to look for a problem.it may just be that the catalytic converter got too hot from the long idling with not enough air flow to help it keep cool(within operating temp)

Well I have a few Ideas for you. One, it has a leak and your dealer needs to find it..... Now if he is using a recover machine that weighs out the same refrigerant as he is putting in, I would say, ok, no leak you have other issues. One is has he used or is he using die in the oil. If so he needs to replace the receiver/drier replace the TXV valve and run a cleaning (flush) agent through your system. If you do not have a leak then there is too much oil in the system and he is adding to that oil with die every time he is adding die to the system. If you pull out all the freon then add it back the oil gets pulled out of the evap and condenser coils for a brief time, as you run the A/c it will work it's way back into the evap. where it hurts the systems ability to cool. Next Idea, is to teach you how to put freon in it your self. But first have the dealer run the flush through the system replace the drier, and see how long it last then. If he does that and that does not fix it. learn how to add freon, it is very easy.

the most common problem with honda and acura is the magnetic clutch failure on the compressor , test to see if you are getting power to the clutch assembly with the car runningand the A/C on max if you have power the compressure clutch is bad if you don't ck the compressure fuse and or the clutch relay.

Are you using gauges?What are the pressures?And are the cooling fans coming on when ac is on?

Did you check the condensor fan to make sure its working

See if it's the compressor by watching the compressor either spinning ( compressor is working ) or not ( compressor not working ). Compressor will not engage if refrigerant is low. Add R-134a ( 12 oz. can )

prob.bad relay