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The GT1 will NOT open the T-stat (It will turn on/off a gazillion other instruments, lights, fuel pump, injectors, etc), but it will give you a T-stat specific code if it's bad. No other scanner will pick up that code. Only GT1, INPA, Autologic and the like. I am not sure an OE or Wahler (which is OE) T-stat will fail that quick, but I have seen stranger things happen. To rule the T-stat 100% out, one needs to scan for that T-stat specific code.
In my case, I did the cooling overhaul, and a few weeks later I had that same symptom the OP has. Also, the OP said he changed the t-stat. That's what my diagnostic was based on, which is NOT 100% accurate. If I were the OP, I would first scan to make 100% sure it's NOT the T-stat. I am 99% positive it will not pick up a T-stat related code, but this is internet diagnosis, so one doesn't see the whole picture......
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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.
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