It is the device on the air cleaner which opens and closes the dampers to the exhaust man. I need to know the name to locate one.
i beleive your mistaken, the valve on the air cleaner does not open the damper for the exhaust manifold. that would be the heat riser, located on the exhaust manifold.
Air cleaner temperature sensor. It controls vacuum to the air cleaner snorkel door mixing the cold and hot air to maintain intake air temperature at about 115* This Standard Motor Products ATS3 fits 73-82 Buicks. Might be the one for you. http://info.rockauto.com/getimage/g...rl=http://info.rockauto.com/SMP/ATS3_FULL.jpg
It's in the floor of the air cleaner. Has to vacuum lines connected to it. One goes to manifold vacuum, the other goes to the snorkel vacuum motor.