Not necessarily, it could just be condensation - this time of year everything's damp and if it's only doing short journeys it'll not get a chance to warm up thoroughly and boil it off. Take it for a nice thrash down the motorway.
Or you could scrape it out add chopped egg to it and make a butty !!
As steve says condensation , had a granada that used to suffer from this because of
short journey's after some long trips it used to clear , iirc i fitted a different
thermostat that made it run a little hotter and that helped a lot .
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