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Too big to fail
 
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Join Date: Jan 2002
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Saab engine running issue

My g/f has an '05 Saab 92x (Saabaru). It's making an interesting noise, kind of like a quiet 'sneeze' with an almost imperceptible lapse in power. If I turn on the air conditioner, it happens about 1s later, and at random ever 10s to 60s thereafter. It doesn't seem to do it with the A/C off, but it's almost 100 today, and I didn't feel like fully vetting that theory.

My guess is a coil pack is going out, although I don't know much about these engines.

Thoughts?
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Old 06-27-2010, 03:32 PM
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Just a shot in the dark. With some Mercedes-Benz products, when the freon charge is low in the system the evaporator makes a hissing noise due to the low charge. Same kind of noise I've experienced with my MB's.
Old 06-27-2010, 03:37 PM
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I'll check that - thanks!
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'03 E46 M3
'57 356A
Various VWs
Old 06-27-2010, 03:47 PM
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is it just the compressor kicking in? I will listen to my car carefully tomorrow and let you know.
Old 06-27-2010, 07:38 PM
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Could be. I topped off the refrigerant this afternoon; it was just barely in the 'filled' zone, but the A/C was blowing cold already.
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"You go to the track with the Porsche you have, not the Porsche you wish you had."
'03 E46 M3
'57 356A
Various VWs
Old 06-27-2010, 09:23 PM
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That is normal on my WRX when the AC cycles on. There is a thermal switch that keeps the evaporator at 35 deg minimum and it cycles and you feel it. With 2 liters not under boost the AC is a sizable percentage of the engine load.
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Old 06-28-2010, 07:48 AM
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