Definitely replace the thermostat
The engine will get to proper operating temp much quicker and a engine at proper operating temperature uses less fuel and puts out less emissions than a colder engine
Plus the heater works better.
So nothing but lots of benefits to be had with a new thermostat.
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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