does the 86 420sel have an STV POA valve? Also should the recirculation door stay closed when the temp wheel is in the blue area even when the recirculation button is off? I have found that If I turn on the a/c to colder temps the door won't open at all whether I hit the recirc button or not. Now If i turn the a/c on with the wheel in the white area the button for the a/c works until I turn it into the blue. If I turn it into the white are, I cannot open the recirc door. Does this sound right?

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual