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, Sat, 6 Sep 2008 16:58:00
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They can make noise when they fail. I suspect the bearing is failing given the sounds you mention. The danger with that is the pulley can seize up which leads to accessory belt disintegration and the potential for related damage. Hopefully, the screeching/chirping isn't you're belt rubbing against a bad pulley.
I haven't replaced a compressor in a Saab yet, but I did replace one in my truck. When I did the truck it was a project, but not overly difficult. For starters, you'll need a new compressor, a receiver-drier, and new expansion valve is highly recommended. Most replacement compressor warranties are void if the receiver drier isn't changed at the same time. But if you've had a compressor failure, it only makes sense to do so.
You'll also need 5 or 6 cans of R-134 on hand (not that the system uses that much-but in case you have to fill more than once), and some PAG oil, or whatever lubricant Saab specifies.
1. vent off the remaining refrigerent
2 remvove compressor, receivor drier, and expansion valve.
3. replace expansion valve and drier.
4. Add proper amount of oil to compressor and install. There are charts that tell you how much oil to add depending on the components being replaced.
5. Vacuum pump the system for 30 minutes or so using a commercial grade AC vacuum pump attached to an AC gauge manifold. Two stage pumps are best. it should be able to take the system down to 28.5 HG or more vacuum. This reduces atmospheric pressure in the system to a point where water in the system will boil at current lower temperature (i.e. 60 deg F.) 27 or 27.5 HG doesn't allow water to boil at less than 90 or 1200 deg. F.) My point is, what may seem like a small difference in Vacuum can make all the difference as to whether the moisture is evacuated from the system or not.
6. Turn off the pump and watch the vacuum readings on the gauges to assure there are no leaks in the system.
7. If no loss of vacuum, fill the system with the proper amount of refrigerent. I attach the first can with the car turned off, purge the fill lines before opening the final valve at the low pressure port and then open the valves to the low side. The vacuum in the system will pull most of the first can in. Then turn on the vehicle, with AC set to max and fan on high. Add the rest of the refrigerent. At some point sufficient pressure will exist in the system for the compressor to start cycling and you should start feeling cool air at the vents.
posted by 66.227.254...
, Sat, 6 Sep 2008 16:58:00
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