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I seem to recall that the TM for my 1984 M923 NHC250 engine calls for a factory 185 degree thermostat. It runs fine out here in hot Southern California with that and the fan only kicks on when climbing hills for a distance. I would just put in the same that came out or whatever the TMs call...

Absolutely. The rebuilt shutter stat has been working just fine for months after the new O-rings. Be sure to clean up all the surfaces in there with some 2000 grit sandpaper or fine steel wool if the surfaces have any buildup or corrosion. Also be sure to use quality O-rings and not just the...

Hi, Swamp Donkey. I updated the post with the part number. I did not try it out yet. However, I received the part number and source from another poster on the M939 / 5 Ton Facebook page a month or two ago.

Sorry. Part number is 1047-35000-29. It is a 185 degree shutter stat.

I just found a great source for the Shutter Stat for the M923, and other models that use the NHC250. Only $82. They said that they try to keep a few of these on the shelf. They were out when I called but said that they were going to make some new ones. Took a few weeks and finally...

I just found a great source for the Shutter Stat for the M923, and other models that use the NHC250. Only $82. They said that they try to keep a few of these on the shelf. They were out when I called but said that they were going to make some new ones. Took a few weeks and finally...

I just found a great source for the Shutter Stat for the M923, and other models that use the NHC250. Only $82. They said that they try to keep a few of these on the shelf. They were out when I called but said that they were going to make some new ones. Took a few weeks and finally...

Thanks, carnac!!!

Thank you, sir. $100 donation has just been made to The Independence Fund. 1984 AM General M923 VIN - C52305295 REG#-NL0FVR NSN-2320010502084 BOUGHT FROM GOV LIQUIDATION, FONTANA, CA BUMPER #- ILLEGIBLE/PAINTED