My 1981 wagon only considered those buttons as ' Mild Suggestions from the driver' and felt free to ignore or wait 20 minutes to respond....
I suspect the canceling of the low and high is proper...
what it relies on to act I am not sure off hand.
Try turning the temperature regulator farther one direction or the other and give it some time to see if it does in fact come on in response to that nudging...
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