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Agree, normal.
I inherited a 69 Cadillac in the early 70's and got the GM manual for it so I could DIY. It described how the A/C compressor would always operate with the climate control in the Defrost position. Reason as Dewfpo stated: dehumidify incoming air for quicker window demisting/defrosting. So it's been standard procedure - on some cars anyway - for a long time.
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Bob (son's 81-244GL B21F-M46, dtr's 94-940 B230FD, my 83-244DL B23F-M46, 89-745(LT1 V8), 98-S90, 77MGB and four old motorcycles)
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