If you got it locally you could take it back for an exchange and say it starts to open too late and hope the new one works better.

This has nothing to do with testing the Thermoset off of the vehicle but after you drive awhile you might feel your Oil Cooler Hoses and see if they are hot indicating that hot oil is actually circulating through your oil Cooler.

If you have cold winters that thermostat would be good to have during winter.

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84 300D, 82 Volvo 244Gl Diesel