Joined: Mar 30, 2011 Posts: 35 Posts per day: 0.01 Location: Charlotte NC
Posted: Tue Apr 24, 2012 8:49 pm Post subject: AC Compressor - fully charged, clutch engages, not cooling.
I had my AC compressor replaced about 2 years ago, everything fully serviced etc. I lost AC at the end of last summer and have just recently decided to tackle the issue.
Previously, the clutch wasn't engaging - I added freon, the clutch does engage, and the system does hold pressure. It's at about 30psi right now (65* ambient temp) but the air isn't any colder than before.
So, I reluctantly bring my issue upon the guys at NAIOA to hopefully provide some insight on this - as you always manage to do for me.
If the compressor comes on, but you aren't getting cool air, you probably aren't up to capacity with the 134. You can still show a decent low-side pressure and yet not be full of 134. If it's only using half of the coil, it's not going to cool.
I don't know what the specs are for the Impala (never had to service mine) as far as how much you need for the system to be "full," but it needs to be full in order to optimally perform.
If you sure you are full, then the system needs to be evacuated and flushed. You may have a blockage somewhere. Typically it's at the orifice tube, but condensers can get blocked also, which will prevent cooling also. You may be able to salvage the condenser if you can flush it, but orifice tubes are like $1, so if it's plugged, it's no biggie. Just have to evacuate, then replace it and recharge the system.
So basically, if the compressor clutch is engaging yet the system isn't cooling, you either have a leak and you're low on 134 or you have a blockage.
Also, make sure your blend doors are working. The system may be cooling ok, but you're feeling warm air due to your temp doors. **just a thought.**
_________________ - 2001 Impala Base - Navy Blue Metallic
- 3800 Series II
RIP 10/23/2010, 191,197 miles - traded on a 2003 Tahoe Z71
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