I don't know anything about a 6320 thermal sensor, but I have experience with the air temp sensor on my Kaw 4010 mule. In the summer the computer sends too much fuel to engine and it idles like crap. I bought a kaw service manual. Ran every test, did a computer scan and everything is within factory specks.
As a last resort, I decide to replace the theromister with a fixed resister with less resistance making the computer think the air was a little warmer. It worked. After playing around trying to make a theromister the resistance I wanted, I finally put OEM thermosister in place and wired another 10K thermosister in parallel with it.
Engine now runs better, idles better and plugs are cleaner than when it was new. I could tell when it was new my fuel/air mix was rich, plugs were a little carboned.
Good luck with your temp sensor problem. I've heard of a guy who has similiar issues with his van. He hung a new water temp sensor beside his engine and it worked better.
I know you always run a risk damaging an engine when you play around tricking the computer. How is that any different than when we play around adjusting the fuel mix screw on a carb? geo
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