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So far Car Quest and Autozone can not reference 13078 as a Stant P/N. Whats up with dat?

I will change it out and see. It's gotta be this but I just found it so odd that the original one and the new one do the same thing. Thanks for the info.

Yes, my valves were leaking so I capped them off. I find it odd that two thermostats that test normal in boiling water have the same symptoms. Hence my boggledness.

I did change the thermostat. It works as tested as did the original. This is why I am baffled. Makes no sense. Yes, when I remove the seat cushion it drops down immediately to 140.

Yes, I have done that. My guage appears to be calibrated. I took it on a 15 mile drive at 50 plus MPH last night and it never warmed up fully. Granted, it was pretty cold out but that should have no bearing on engine temp if the thermostsat is doing its job.

I dont have a heater. I bypassed it and removed it. It is an M151.

That is true. I have never gotten it up in RPMs on the road but it is a small engine and the thermostat should hold the water back till the engine heats up.

I have used my truck in my back 40 for a week now. Put 35 miles on it. The only way to get it above about 130 degrees was to suck a seat cushion to the grill to get it to temp. I thought the thermostat was stuck so I bought one. If you need a replacement from an auto parts store, I got mine from...