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Re: AC won't blow cold
Yes you can charge the system, kits are available at any good parts store. Let me ask these questions before you attempt repair
1. Is the system charge low, no pressure in the lines?
2. If the system is low on refrigerant then there must be a leak, you must fix the leak 1st or you are throwing away good money, the new charge will leak out in short order.
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I'm wondering if it's NOT the AC but the blower fan, how does the heat side blow? if it's good on all blower settings then, it's more than likely your blender door is not opening and closing all the way. When the blender door stays open a little bit it'll let warmer outside air mix with the cold AC air causing it not to be as cold as it should.
You've got some of the picture, but not all of it. You need to know what the high and low side readings are, so yes you do need the gauge set. If the system is charged, and the low side is not dropping below 25psi, I would guess the low side pressure switch is faulty. But if the low side is dropping below 20psi when the compressor stops, the system may be low on freon. Which means you have a leak somewhere. The hissing noise is freon flowing thru the system which could also indicate a low charge.
The symptom you have is in most cases caused by a low system charge of refrigerant due to a small leak like a front compressor seal. Have an AC repair shop hook up a set of AC pressure gauges and see what the pressures are in the system, this is how you verify a low charge.
Replace the blower motor resister,this is the speeds for the blower motor,it is located very near the blower motor,and is mounted on the blower box,and it actually goes inside the box,to keep it cool.The reason for it`s failure is the blower motor,even though the blower motor sounds,and runs good,it is drawing too many amps.If this was at all helpful,please rate,thank you.
with a dual climate control system, it is imperative for a proper refrigerant charge to be maintained. the symptom you describe is a possible indicator of low charge on the system. the ac evaporator core is closest to the right side of vehicle thereby making air feel cooler on that side, on the left side of the vehicle the cooled air has farther to travel and warms up from cabin air before it discharged from the vents. this is the most probable issue for your vehicle...however if the charge is accurate, the issue would be more so in the air temperature doors which is located deep inside the dash...i hope this helps...good luck!