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What is the proper engine temperature range?

OK, replaced the thermostat housing and the plastic plumbing behind it. It still runs over 225F, BUT it does not overheat anymore! (Still hotter than I like it though!) Any thoughts on how to get the temperature down any lower, say to around 190?

So! I went and rechecked the engine coolant and degas levels. LOW. I looked and found that my shiny new thermostat is leaking all over the damned place due to a faulty seal. CRAP. So now I have that to fix too. I guess I will get back to you when I get some work done, thanks for all the help so far!

Hello all again! Here is some info I forgot to include, the fan DOES come on, I neglected to mention that. I have seen no leaks of coolant from anywhere except the Degas when it overheats, and from the engine coolant cap on the front of the engine. That is where I fill it from. So here is...

Hello all, I am working on a FINE Lincoln LS from 05, and I cannot figure out why the hells she keeps overheating! I have changed the thermostat 2 times, the engine head temp sensor works fine (I use it with my OBDII sensor) and I have bled the system of air. I just cannot figure what is causing...