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Addendum from my other post....I just was able to look at my "Climate Units" green book (TP 8707201 Section 8 (87)) which has a great breakdown of the entire ACC system. It verified that the coolant temp "Switch" is mounted in the other heater hose that the coolant flow valve is not. It is close to the valve near the fire wall. It is a switch and not a sensor that 'closes' at 86-104 degrees F. If you have many problems with your ACC you should look for this Green book. They are sometimes for sale on eBay but Volvo still offers them new. Go to the Volvo website and find the book store. Page 235 is devoted to this switch. Good Luck- Scot
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