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ACC question
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Posted by skibumm100 [Email] (#3255) [Profile/Gallery] (more from skibumm100) on Sat, 17 Feb 2018 07:07:28 Share Post by Email
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When a late model (1996-97) 9000 is started during cold weather and the ACC is in "Auto" mode, the fan runs at some minimum speed until the engine warms up and then the fan speed increases to achieve the temp setting programmed. How does the ACC know the engine is warmed up and it's OK to speed up the blower fan? I assume it's a coolant temp sensor signal, possibly sent from the ECU, but I'm not sure. I can't remember if there's more than one coolant temp sensor. The only other possibility would be an air temp sensor somewhere in the HVAC ductwork. All of the 9000's I've had have worked this way except my 1996 model. It cranks the fan up to full speed right from the beginning and blows ice cold until the engine eventually warms up. I have it programmed to come up in manual but that requires button pushing to get things the way I want once the engine warms up. Kind of defeats automatic climate control. The system also does not recognize when it should automatically turn on the defrosters. Doesn't matter how cold it is outside, I have to turn them on manually. I have swapped out the ACC with a known good one, same results. TIA.

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