Hey I am haveing a problem with My 2500HD ac system. I have changed The Condensor, evaporator, and the Compressor. I have charged it to the correct levels. It blows cool air, but it doesn't get cold. Everything seems to be working properly, but no cool air.

The best I can tell u is that the smell is from a leak at the evaporator or connections. I advise to get another opinion because it sounds like a lot of guesswork. if u get the work done, make sure the work comes with a warrantee! I gave all my customers warrantees for 20 years. That's part of the diagnostic business! Good Luck If u don't get a warrantee ,don't get the diagnosis or work done

the expansion valve (TX valve) is located at the inlet side of the evaporator
. the receiver/drier has to be replaced when the system has been opened
did you install the correct compressor for the type of gas in use
are you charging the system through the correct port using the correct gauge
From what you say is going on , you need the services of an accredited ac specialist shop soon before you blow too much more money

Not sure specifically on that model but if you follow the line from the compressor to the condensor then out of the condensor to the evaporator it will be between the condensor and evaporator usually the tube is wraped in plastic but it could be in the heater box itself also if you have rear ac the rear unit uses a thermal expansion valve on the rear evaporator not an orifice tube. What is your concern thats leading you to find the orifice tube if your dont mind me asking

When you change out the compressor, the receiver dryer needs to be replaced as a matter of prevention. The condenser is fine as well as the evaporator but the orifice tube should come out because the whole system should be flushed. That is why overhauls on AC systems are so expensive.

The system may be under charged. Does the compressor kick on? The blend air door for the hot and cold may be stuck in the heat position. The tempature setting moves a blend air door between the heater core and the A/C evaporator.

LOW PRESSURE SIDE IS THE SUCTION CHARGE SIDE WILL BE FROM AC COMPRESSOR REFRIGERANT LINE TO THE ACCUMULATOR OR DRIER TO THE EVAPORATOR IN THE FIRE WALL THE AC COMPRESSOR LINE TO THE CONDENSOR IS THE HIGH PRESSURE SIDE YOUR DISCHARGE SIDE. DONT DONT TRY CHARGING AC SYSTEM AT THE HIGH PRESSURE SIDE. CHARGE AT THE LOW PRESSURE SIDE.

You had a compressor failure

Now you have a big job ahead of you

You will have to install a new compressor

Remove & Flush all hose assy's

Remove & flush the condensor

Replace the drier or accumulator

Flush the evaporator in place

Put new oil in all components in the correct amounts

The low pressure port on an AC system is between the evaporator and the compressor. The evaporator is the cooling coil in the dash. I believe you will find an accumulator just on the "out" side of the evaporator. The accumulator is a round aluminum container about 4 in. in diameter and about 7 in tall. It has a tube from the evaporator going in near the top, a tube/hose going from the accum. to the compressor and probably a pressure switch and a charging port. All these items are located around the top of the accumulator. That charging port is the low pressure, (suction side of the compressor). Don't over charge. Use just enough to get cold air from the system. I doubt this system has a sight glass in the tube near the condensor, but if it does, put in just enough refrigerant to where you no longer see bubles going past the sight glass. If this is a cronic leak, you must have the leak repaired. It is aginst the law to recharge AC systems without repairing the leak.

Thanks for using FixYa. Good luck.

May have an issue with your evaporator. Its not holding charge therefore its not keeping the refrigerant cold enough or at all. Have a repairman check your ac system.

Several possible causes. Knowing the state of refrigerant charge would be helpful. Assuming it has a 'full' charge (full charge 680 Grams = 1.50 Pounds) Most common causes of AC problems:
1. Thermostatic switch (sensor) malfunction in the evaporator - allowing the evaporator to ice up. Check the vent temperature (using a cooking thermometer) to see if the temperature gets near or below freezing (32 Deg F.). If so, the thermostatic switch in the evaporator is defective. Replace it.
2. Refrigerant UNDER-charge. If the temperature does NOT get near freezing, then you need a set of AC gauges to check the compressor head pressure (High side) and the suction (Low side). High side pressure (nominal) is 229 PSI (+ - 20 psi) @ 2000 RPM. Low side (nominal) is around 20 to 40 psi. NOT common problems:
1. The magnetic clutch coil on the compressor... as it heats/warms up, the coil windings could be going 'open" circuit which would turn the compressor 'off.'
2. Compressor inefficiency (worn out).
3. Expansion Valve
4. Clogged Condensor