A/C Comes On. Goes Off. Then Comes On for Rest of Trip (until next time) - Page 2 - The Saab Link Forums

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Car Problems? NG900 or old 9-3 Only If you're experiencing problems with your NG900 or 9-3, post your question in here. CEL Code or GTFO!

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Old 02-24-2011, 08:29 PM   #21
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I never had the ACC/Blower issues that you are having, but I'll share my experiences. The radiator fan should run on slow speed when the A/C is on. Mine did not. It ended up being a broken wire on the reciever/dryer. The grille rubbed against it 'til it broke off. I'd get the cool air from the A/C on startup then it would go warm unless the radiator fan came on (high speed) to cool the engine or the car was moving at 30+ mph. Also, if the cabin air filter is clogged (mine was) you'll only have sufficient A/C when the ACC is in the recirc mode. Once I fixed the broken wire and changed the cabin air filter, my A/C worked perfectly. I had two problems, maybe you have more than one problem. Good Luck.
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Old 03-01-2011, 02:27 PM   #22
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Ok, if you want me to, I will try to brake it down. But the thing about Motronic was just an example, I don't think Motronic is causing this. On top of that, you probably have Trionic. I been looking at your pictures of your ACC. To me it looks like the ACC gone in to a mode, where you are not allowed to control the ACC? But on the other hand the screen "say's" that the fan is on speed 2? Which it is not, I cant imaging any signal that would cause a situation like this. I would concentrate the fault tracing, first on the fact that ACC "say's" that the fan is on, but it is NOT, and just hook up a testlamp to the power to the resistor to see if the box is sending power to the fan. But you said someone was talking about a "fancontroll box" in that case, do not hook up a testlamp, you can ruin the box, if it is a electronic box.
Ok, I guess im advanced mode again, sorry. Give me some specific question, and I try to brake it down. If you had not already tried 2 other boxes. I would say: Software, or the box itself. Are you sure the boxes you tried was software wise compatible with your car?
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a/c, blower, electrical, grounded, resistor

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