Good point. If this occurs while on the highway and while you hit traffic lights, this is normal.

If it is flucuating that much on the highway at high speeds, i.e., > 50 miles per hour without touching the AC, this would make me think something is up with the thermostat of something else.

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'89 420 SEL
'90 300 SEL
'68 Olds 88 Convertible
'84 300 SD (sold it)