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From what I recall the temperature sensor activates a solenoid under the dash. This solenoid connects to the vacuum reservoir via a hose through the dash on one side. The other side also goes into the engine compartment and connects to the heater valve. These are small vacuum lines. You should hear the solenoid click if it is working. The click will be up and to the left of the glove box.
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1987 944 Summer
2006 E90 Winter
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