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Old 06-03-2009, 12:35 PM   #1
Scooby Newbie
Member#: 97677
Join Date: Oct 2005
Location: Seattle, WA
1998 Impreza 2.5 RS

Question '98 2.5 RS Air Conditioning Issue - Help


I have an 1998 Impreza w/ about 200k on it. Not sure if the a/c pump is original or not, but I'm having some weird issues.

It will blow ice cold for between 2-15 mins, then it will start making a whining noise from the pump (sounds like a supercharger whine) and will make short air burst noises that I can feel in my acceleration.

I figure I'll just replace the pump and dryer this weekend, but the fact that it blows super cold intermittently makes me question the root problem. Any advice?


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Old 06-03-2009, 08:16 PM   #2
Scooby Specialist
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Bailey, CO
2001 2.5RS
Black Diamond Pearl


have it checked for the proper amount of coolant before replacing parts. it may just be acting up from that. Also check in the service & maint. forum, there are a lot of AC questions there.
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Old 06-04-2009, 10:29 AM   #3
Subie Gal
Super Moderator
Member#: 301
Join Date: Sep 1999
Chapter/Region: NWIC
Location: WA
1970 FF-1 & '70 Van
02 WRX/01 RS


does sound like the compressor is failing....

hard to diagnose on the internet though
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Old 06-04-2009, 11:15 AM   #4
Scooby Newbie
Member#: 97677
Join Date: Oct 2005
Location: Seattle, WA
1998 Impreza 2.5 RS


I agree on the internet diagnosis.

One last item before i replace it this weekend. This morning, it blew freezing cold the whole 30 mins to work. It appears to work fine when the temp outside is colder. Could that mean it's low on coolant?
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Old 06-04-2009, 01:43 PM   #5
Scooby Guru
Member#: 4800
Join Date: Mar 2001
Chapter/Region: TXIC
Location: Houston, Tx
1990 Legacy & 97 OBS


Just a quick terminology thing. It's a compressor, and it takes refrigerent.

I just evacuated, replaced the receiver drier, and charged the AC system on my 1997 OBS last weekend. I was experiencing very frequent cycling and increased engine draw/load due to the compressor. There was most likely moisture in the system. There's probably still some debris in the expansion valve, but it works much better.

Do you hear any hissing noises coming from the glove box area? You may just be low on refrigerent & possibly oil. It's typically to lose about 1 oz of refrigerent every year. If you have not added any refrigerent, it very well may be low.

If you decide to open things up, make sure you have a vacuum pulled on the system for at least 30 minutes, verify the system has no leaks, and then recharge. Additionally, if you do open things up, the AC system needs to be stabilized. This puts the "normal" amounts of oil in the appropriate spots so you can add the correct amount of oil back into the drier for example when you replace it. To stabilize the system, run the AC on full fan outside air for 10 minutes.

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