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Old 07-01-2018, 12:03 PM   #1
CheebaCheeba
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Default AC issue cold air blowing from just 1 vent.

Hello everyone. My ac in my 2012 subaru impreza seems to only cold air out of the middle right vent. I evac and recharged the system and now the other vents blow a little bit colder and the middle right vent blows much colder than the other vents. when my rpm is above 1500, the ac does get colder but again very cold in the middle right vent. I do not have duel climate control. Could this be a compressor issue?
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Old 07-01-2018, 12:50 PM   #2
Charlie-III
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My guess is blend doors in the dash are not working right. There is usually only 1 cooling unit and doors direct flow.

On a cool morning, try high heat, do you have the same issue? My guess is yes.
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Old 07-01-2018, 02:39 PM   #3
CheebaCheeba
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The blend doors are fine. I checked the blend door actuators and they are fine. Also when the blend doors go, i was told a check engine light would show. Heat seems to blow fine, just an issue when ac is being used.
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Old 07-01-2018, 06:12 PM   #4
Elbert Bass
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No, not a compressor issue. What are your suction and discharge pressures at idle? How much refrigerant did you put in the system?

It is not uncommon for a low refrigerant charge to give you warmer air from the left vents on Subaru.
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Old 07-01-2018, 06:59 PM   #5
Charlie-III
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Quote:
Originally Posted by Elbert Bass View Post
No, not a compressor issue. What are your suction and discharge pressures at idle? How much refrigerant did you put in the system?

It is not uncommon for a low refrigerant charge to give you warmer air from the left vents on Subaru.
Interesting, I will try and remember that.
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Old 07-02-2018, 09:40 PM   #6
Bikelok
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Quote:
Originally Posted by Charlie-III View Post
Interesting, I will try and remember that.


Quote:
Originally Posted by Elbert Bass View Post
No, not a compressor issue. What are your suction and discharge pressures at idle? How much refrigerant did you put in the system?



It is not uncommon for a low refrigerant charge to give you warmer air from the left vents on Subaru.


Iíve had this exact situation happen on 2 different Subaru.
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Old 07-10-2018, 04:34 PM   #7
kokoshoe
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+1 on low refrigerant
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Old 08-13-2019, 01:28 PM   #8
FFWD
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Bumping this thread. I have the same issue, and bought the HVAC manifold tool from HF to top it off myself. With ambient temperature at 27 C (80 F), at idle the pressures were LOW=21 PSI, HIGH=125 PSI. I started filling with pure R-134a (no leak stop, etc), I was able to get the LOW pressure up to 30 and the HIGH pressure to 150, and at that point I stopped because the air from the vents wasn't getting colder. Also, the liquid that I could see from the sight window in the manifold tool stopped evaporating into gas, so I was concerned I reached a maximum pressure. Any ideas what I did wrong, or if something else is going on?
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Old 08-13-2019, 03:14 PM   #9
FFWD
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OK, problem solved. I figured if there was an issue with the compressor or any other components, I couldn't break it more and had nothing to lose, so I kept trying to increase the pressures. By revving the engine, the low side pressure dropped and I was able to get more of the liquid to evaporate and I could start feeling a difference. I stopped at just under 50 PSI LOW and just over 200 PSI HIGH at idle. This may or may not be on the high side, I don't know, but I chose to go a bit higher to get better cooling at idle (like when sitting in rush hour traffic).
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