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Ducman,
Maybe I missed the post where you removed the entire thermostat and oil lines from the vehicle. Removing the cooler lines from the thermostat on the vehicle is a difficult job due to the aforementioned corrosion and the limited access to work angles.
Dropping the entire systems doesn't take long. On the bench or ground, there's easy access for any manner of removal suggested, either by cutting the oil line fitting with a Dremel or equivalent or using heat with Kroil or PB Blaster and a couple of wrenches and 3 foot handles.
However, your latest assessment of your heating issues is correct. I'd step back and think this through and confirm the problem is not something else, then proceed. For example, if the supply the line to the cooler is cold or at least not hot, that would indicate partial or full blockage (bypass) at the thermostat. Check the easy stuff first (debris in engine, slipping drive belt, incorrect timing, incorrect heat range spark plugs, etc.).
Hope this helps,
Sherwood
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