Yes, most probably it is the potentiometer on your heater control panel. Before you buy a new potentiometer, try melting the solder on the connectors of the potentiometer. With a bit of luck, you will solve your problem. If not, then a new potentiometer or complete heater control panel.
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Current car: 2002 S40 1.9D, 1992 240SE
Nullius in Verba
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