Re: Was the AC compressor for me - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Was the AC compressor for me
Posted by B. Millar (more from B. Millar) on Thu, 4 Jan 2007 13:42:39
In Reply to: Was the AC compressor for me, AeroPDX, Thu, 4 Jan 2007 13:12:08
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See if it goes away when you hit the ECON button. Most of the time it's actually the expansion valve rather than the compressor itself. Rather than having the compressor cycle on and off it's always on in the Saab when it's above a certain temperature outside (38 degrees?). The expansion valve regulates the amount of coolant that flows through the system. When the expansion valve gets old and tired it makes that annoying sound. Mine is doing it right now. You don't necessarily need to replace it yet; they last a long time. If it were the compressor it would die completely within 2 or 3 days of starting to make the sound. For me, now that it's cold out I programmed the ACC to start out in ECON mode when I start the car. If it's rainy and cold out I need to turn ECON off so the defrost will work properly.
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