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My A/C unit is not cooling properly, it blows air but not cold like it use to, it's Intermittently. We just changed the cabin air filter but it didn't help. I noticed this a few months ago but now it's happening more often.
Several items can cause inadequate cooling including the loss of refrigerant, a malfunctioning compressor, or a defective evaporator. These aren't easy DIY diagnostics, but you can check fuses and make sure you don't also have the heat turned up (hey, it happens). You might have to visit a dealer or A/C specialist shop.
I hardly ever turn the ac on in my W204 and prefer driving with the windows and sunroof open.
Last summer I decided to turn it on just to check if its working and it was blowing hot air. Long story short I added about 1/2 can of refrigerant in and back to cold air. I made sure to use straight refrigerant with no stop leak stuff that can clog up the sytem.
I used my Foxwell OBD scanner to see refrigerant pressure, see the evaporator temps and function test the ac compressor as well as check for any fault codes. Seeing the evaporator temp was helpful to determine if it was an ac issue or vent issue like blend doors not functioning.
With the scanner I saw the ac compressor was turning on and functioning but the refrigerant pressure remained low and the evaporator temp wasnt getting colder. Bought an inexpensive refrigerant install hose with gauge and saw when the ac was turned on the low side refrigerant pressure dropped.
I wrote a thread on what I did but cant seem to find it.
When i was done the low side pressure was around 36psi on the gauge and was seeing around 10-11 bar on the scanner depending on fan speed. Evaporators temps dropped indicating it was colder.
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