If you're using the stock D-jet fuel injection, you should use a 180°F thermostat.
The fuel mixture is adjusted by engine water temperature and a 160°F thermostat will cause the fuel mixture to be richer than required.
Make sure you're using the correct style of thermostat and seal.
I suggest you take a picture of what you've installed in case you need to show it to somebody.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502 hiperformanceautoservice.com or oldvolvosonly.com
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