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Discussion Starter · #1 ·
My car has 50,000 miles only and I never had an issue with my AC until last week. The AC just suddenly stopped working and only air blows but not cooled air, even when set to "Lo".

Coincidentally this happened at the same time. Whenever I turn on the AC on, the air re circulation button also turns on at the same time. This never happened before and I found it odd that it suddenly started happening. Is there an option to turn this off or did I or my kids press something for it to start doing this every time I turn on the AC?

I tested the relays, fuses, etc and they all seem to be working. Also, where is the compressor for the AC on the MDX? I can't seem to find it. Thanks!!
 

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1) If your AC is set to "Lo" it is likely to turn air to recirculation first to cool off the car faster. Test it by setting the temperature to 77 F, for example, and press "Auto". Check if the recirculation is turning on automatically.

2) The compressor is located directly under the alternator (which was a small pulley) and has a very big pulley:
 

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I've had my OEM A/C fail on my 06 TSX and 08 RDX. Think about going aftermarket to repair once you narrow down the issues. Acura wanted $1500-$2000 to fix the A/C compared to a local shop at $700 (parts/labor).

Is your A/C not working at all? I've had issues with A/C being intermittent and only cooling at higher speeds (bad radiator/condenser fans). I've also had an issue with the A/C unit putting out too much pressure and slowly blowing out the refrigerant out the seals (had to replace). I also had my A/C compressor on my 08 RDX replaced under an extended 100k warranty because of a faulty clutch on the unit (you don't hear the clutch clicking on/off to run the A/C compressor).
 

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I am not sure if it is a problem on MDX but on my parents RL I had to change AC clutch twice. It just stopped working and AC was not engaging. First OEM replacement lasted only TWO YEARS, 2nd one going strong for at least 5 years... So if my AC would stop working, AC clutch is a first thing to check.
 

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the re-circulation is normal, and almost necessary to cool down a car, you likely never noticed it before, or the car was in conditions where it wasn't necessary.

Definitely make sure to check and recheck the Relay's as they are common to go and will cause exactly this.
 

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Discussion Starter · #6 ·
Thanks for the responses everyone! I do apologize for the delay but I had family issues to take care of so this took a backseat until now.

1) If your AC is set to "Lo" it is likely to turn air to recirculation first to cool off the car faster. Test it by setting the temperature to 77 F, for example, and press "Auto". Check if the recirculation is turning on automatically.

2) The compressor is located directly under the alternator (which was a small pulley) and has a very big pulley:
Thank you! You're right. I tested it by setting the temp to 77 and the recirculation doesn't turn on when I turn on the AC/Air now.
Is that picture from the POV of underneath the car or on top from the engine bay?
I've had my OEM A/C fail on my 06 TSX and 08 RDX. Think about going aftermarket to repair once you narrow down the issues. Acura wanted $1500-$2000 to fix the A/C compared to a local shop at $700 (parts/labor).

Is your A/C not working at all? I've had issues with A/C being intermittent and only cooling at higher speeds (bad radiator/condenser fans). I've also had an issue with the A/C unit putting out too much pressure and slowly blowing out the refrigerant out the seals (had to replace). I also had my A/C compressor on my 08 RDX replaced under an extended 100k warranty because of a faulty clutch on the unit (you don't hear the clutch clicking on/off to run the A/C compressor).
Yea, my AC is not working at all. The compressor doesn't kick on at all and I tested the relay underneath the hood. I swapped the AC Compressor relay with the high beam relay and it still didn't kick on. When I put the AC Compressor Relay on the High Beam plug, the high beam works so I don't think the AC compressor relay is bad.

I am not sure if it is a problem on MDX but on my parents RL I had to change AC clutch twice. It just stopped working and AC was not engaging. First OEM replacement lasted only TWO YEARS, 2nd one going strong for at least 5 years... So if my AC would stop working, AC clutch is a first thing to check.
Where is the AC Clutch if you don't mind me asking? I'm a pretty decent DIYer (I've done my own brakes, pads, calipers, rotors, etc but anything with engine or transmission I don't touch) so is the AC clutch easy enough for me to do it?

the re-circulation is normal, and almost necessary to cool down a car, you likely never noticed it before, or the car was in conditions where it wasn't necessary.

Definitely make sure to check and recheck the Relay's as they are common to go and will cause exactly this.
The compressor doesn't kick on at all and I tested the relay underneath the hood. I swapped the AC Compressor relay with the high beam relay and it still didn't kick on. When I put the AC Compressor Relay on the High Beam plug, the high beam works so I don't think the AC compressor relay is bad.

I took a video (see below) and I'm not sure if you can see it clearly but the 2 small pulley near the bottom doesn't turn like the big pulley on top.
 

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You need to get a look at the AC compressor and have your wife or somebody turn the A/C button on and off and see if the clutch is engaging the compressor. After they've worn in some you need to take a shim out or get one that's thinner so it can engage again. If the compressor is indeed engaging then you likely need the system charged or worst case have a leak somewhere.
 

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Discussion Starter · #9 ·
I found out that there is a BIG leak coming from the compressor area. I added an entire 20oz can of AC pro and I heard the leak and within minutes it all leaked out. Any way for a DIYer to check where the leak is or would I need to bring it to a mechanic?
 

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I found out that there is a BIG leak coming from the compressor area. I added an entire 20oz can of AC pro and I heard the leak and within minutes it all leaked out. Any way for a DIYer to check where the leak is or would I need to bring it to a mechanic?
You can get a can that has UV dye in it, then you just use a UV light to find your leak. I would make sure the stuff you buy is just dye though, no sealers or any of that stuff.
 
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