Ok here's a shot out of a cannon. So my 1983 240d runs a little hot even when its not summer time, I'm running around 90-95 degree C instead of being around 80 to 85C. So a few months ago i bought a new thermostat since its so easy to replace, and for everyone's info when we got the car back in 2014 the entire cooling system was replaced with new parts. However I don't know if the wrong thermostat was installed or if it became defective after a few years because now I'm idling at stoplights and driving down the freeway around 90-95C as stated before. What is peculiar to me is that I bench tested the new thermostat today and it began to open at around 190 to 195 degrees F instead of 176 degrees F.

190-195F=87-90C, 176F=80C I don't think I'm being to unrealistic when I say I would like the car to run a little cooler year round closer to what factory specs say. And I know the thermostat is not magically going to open all the way at 80C, if I'm not mistaken it should open +/-2 degrees C from 80C. But I was just curious what everyone thinks is wrong since my weekend project got really confusing, the thermostat I'm using is a Stant that is rated to 176 degree F or 80 C and that is the new thermostat I bench tested that is acting strangely.

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