I have a 2005 Acura MDX, and the air conditioning recently has not been working the way that it should. I had my compressor replaced June 2023 and it’s only been a year. I did check and my compressor is turning on and working fine. I checked my freon and it is full. The weird thing is that semi cold air will blow if the fan is on the 2 lowest fan settings but anything higher it blows hot air. Even on the lowest setting it can’t keep up and the air never cools down. I checked my cabin air filter, and it was filled with leaves and needed to be replace. I replaced the filter and cleaned out the leaves and debris, but the issue is still continuing. I am unsure of what is wrong, but I would like to fix it myself if it’s something small.
How did you check that the system has enough refrigerant?
Tester
That’s a good question, my dad did it for me lol. I asked him to add more refrigerant and said it was full.
So, you’re providing second hand information?
Hard to help someone when you don’t get first hand info.
Tester
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Sorry, that was the only thing I didn’t know how to do on my own.
You say AC clutch IS engaged at all fan speeds? Fan on low-med-hi? It sounded like you said ac feels cool at low speed but not cool at hi speed. Or did I Hear you wrong?
Yes, that is correct.
My advice, take your car to an AC specialist, It will cost to have it diagnosed, but shop might wave the fee if they perform the work.
Many possible sources of error. Could be a blend door, high fan speed, more air through the heater core.
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Is the fan in the engine compartment running when the A/C is on?
Is the accumulator getting cold/frosty?
When the compressor was replaced, was anything else in the system replaced at the same time or just the compressor?
If you look under the hood you will see two refrigerant lines - a big one (low side) and a small one (high side). The big one (low side) should be cold when the A/C is running. Not just cool but cold. Is it?
So how does your dad know it is full, and if he is experienced enough to know the freon is full, then why didn’t he diagnose your vehicle while he had the AC manifold gauges hooked up to the vehicle checking it out, or a refrigerant recovery machine that sucked all the freon out, pulled a vacuum, and charged the system back up with the correct amount of freon??
Since the system has the correct amount of freon in it, what is the head (high side) and low side psi readings at (engine) idle and around 1500 rpms as well as static pressures?? What are the temps coming out of the vents??