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Hey I kind off have the same problem, first I replace the clip under the dash and check the heater control valve, the linkage on the valve pop out and since it is spring loaded, it stay in the open position.
I change the heater control valve and it solve my problem. Hey! You could also have the some as Vern, since it is vacuum controlled.
Almost forget about my favorite button. The one under the circulation button called defrost make sure it is not depress. I called it instant heat button, because when depress, it bypass your setting. the Fan gone to high speed, it closed the AC door it turn on your side rear view heated mirror and also your rear window defroster. Even in Florida I have used it a lot off time since I work at night and drive home in the morning (grave yard shift)
Good Luck
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Bud
87 930 black
86 951 black
87 944S white
86 944 N/A red (parts car)
83 944 N/A white (auto)
83 944 N/A black
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