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  #1  
Old 04-30-2011, 05:57 PM
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A/C Compressor sometimes does not turn on

Just had the system completely vacuumed and refilled - When the compressor turns on, it works great. But about 1/4 times, it just will not engage until about 15-20 minutes later. I can't figure it out. Does anyone have any ideas why the compressor would wait to turn on, if the pressure checks out fine?

Thanks,
Geoff
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  #2  
Old 04-30-2011, 07:57 PM
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Re: A/C Compressor sometimes does not turn on

I'd try pulling codes from the climate control unit; it's ridiculously easy. See the attached (toward the end).
Attached Files
File Type: doc check SVX codes.doc (30.5 KB, 121 views)
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  #3  
Old 05-01-2011, 11:59 AM
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Re: A/C Compressor sometimes does not turn on

Looks like it's reading a Code 15 - Refrigerant temp sensor open

Is this something I can take care of, or should I take it to the Subie dealership?
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Old 05-01-2011, 12:08 PM
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Re: A/C Compressor sometimes does not turn on

http://serial.cc/pdfs/AC___HEATER____AUOTMATIC.pdf

See page 22 for the location of that sensor. Probably not the easiest thing to get to, but you could get lucky and it just be a loose plug or something.
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'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project

'97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod

Now a mod "over there" ............Photo album
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Old 05-01-2011, 12:28 PM
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Re: A/C Compressor sometimes does not turn on

So I have to remove the glove box, and it's somewhere down there? My guess is that the system would need to be evac'd beforehand?
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Old 05-01-2011, 01:13 PM
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Re: A/C Compressor sometimes does not turn on

I'm not exactly sure how to change that sensor out. I'd first get a replacement sensor and then evac the system, then take apart as much of the dash/glovebox area and swap it out. Test it before putting it back together.
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'97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod

Now a mod "over there" ............Photo album
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  #7  
Old 05-01-2011, 03:44 PM
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Re: A/C Compressor sometimes does not turn on

Quote:
Originally Posted by icingdeath88 View Post
I'm not exactly sure how to change that sensor out. I'd first get a replacement sensor and then evac the system, then take apart as much of the dash/glovebox area and swap it out. Test it before putting it back together.
I wouldn't think it would be necessary to evac the system...

Keith
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Old 05-01-2011, 03:55 PM
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Re: A/C Compressor sometimes does not turn on

Quote:
Originally Posted by kwren View Post
I wouldn't think it would be necessary to evac the system...

Keith
Keith - Have you done the sensor replacement before? I'm just trying to figure out its complexity. I haven't even seen the evaporator core yet.
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Old 05-01-2011, 05:03 PM
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Re: A/C Compressor sometimes does not turn on

I would first make sure that the system is properly charged. I have been told that when they are not properly pressurized it will cause compressor to act sketchy.
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  #10  
Old 05-01-2011, 05:04 PM
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Re: A/C Compressor sometimes does not turn on

Quote:
Originally Posted by Cam View Post
I would first make sure that the system is properly charged. I have been told that when they are not properly pressurized it will cause compressor to act sketchy.
It is. When the compressor does run, it's perfectly charged - Just had a local shop take care of that.

It's just that the compressor won't run sometimes...and the HVAC is giving me code 15.
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  #11  
Old 05-01-2011, 05:42 PM
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Re: A/C Compressor sometimes does not turn on

Quote:
Originally Posted by kwren View Post
I wouldn't think it would be necessary to evac the system...

Keith
That's just what I would do because I don't know any better .

$5 says there's a loose plug that's preventing it from working.
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'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project

'97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod

Now a mod "over there" ............Photo album
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