New answers tagged golf
I found out what it is. It controls the air recirculation flap to the cabin. Nothing to do with the engine at all. Just above the input and output pipes to the heater core on the firewall is a little plastic nozzle. This is what this actuator is supposed to be connected to.
Found out this actually requires another O-ring, not a gasket. Another O-ring came with new the thermostat and I was able to use that.
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