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This last summer I bought my first Volvo. A '91 740. Now that it is getting colder up here is WI I am finding that she doesn't like to heat up or stay heated up too well. If I let her warm up in the driveway the temp. gauge will start going down when I drive her. The only time that it will stay warm is when I am on the freeway for an hour or so. I thought first I would change the thermostat and if that didn't work I would block off some of the radiator with cardboard. Does this sound logical? Anyways last weekend I got a new thermostat and was ready to replace the old one but then I found out one of the nuts holding the thermostat in won't budge and started to round off. Now what am I to do? The wife suggested taking a chisel to the old nut and replacing it with a new one, but I wanted to see if there were any other ideas before I did this. Thanks
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