"Normal" temp gauge position for the needle is a fraction under or just touching the right hand of the 2 white central indicators. It might go just above that indicator if stuck in hot traffic but should come down again once you get on the move. 90º in NY will put it to the test.
What exhaust system do you have? Is it standard Volvo or aftermarket? Check for leaks. A gloved hand over the outlet will show them up easily. If you have the Volvo cast iron exhaust manifold, the joint to the pipe can leak and burn out the gasket. Retainer nuts not so easy to tighten, especially the one near the block.
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