Go back to the OEM thermostat 187F the 165F will not help cooling as the coolant temp at 195F the 187F thermostat is wide open. The 165F stat will cause added fueling and lower fuel economy since the PCM sees the engine as running cold. I suspect an air flow problem such as debris in the condenser or between the radiator and condenser or the water pump is a poor aftermarket. I live in AZ and summer temps get to 118F and my 04 with 260000+ miles never overheats and i run the OEM thermostat 187F.
You will need to change the frame for the longer box, much easier to get a 5.5 ft. box.
Try the GM wiring. https://www.google.com/search?q=gm+trailer+wire+colors&hl=en&sxsrf=ALiCzsbOtmePqUAjWsfYOd4pgOxPiFQfcg%3A1659476368589&source=hp&ei=kJnpYqbaHYHXkPIPzoaMmA0&iflsig=AJiK0e8AAAAAYumnoMEF9v-u1aaVHhA0M8hUYSPRNDTO&oq=gm+trailor+wire+&gs_lcp=Cgdnd3Mtd2l6EAEYADIECAAQDTIGCAAQHhAWMgYIABAeEBYyBggAEB4QFjIGCAAQHhAWMgYIABAeEBYyBggAEB4QFjIGCAAQHhAWMggIABAeEBYQCjIGCAAQHhAWOgcIIxDqAhAnOgQIIxAnOgsIABCABBCxAxCDAToRCC4QgAQQsQMQgwEQxwEQ0QM6CAgAELEDEIMBOggIABCABBCxAzoFCAAQgAQ6CwguEIAEELEDEIMBOggIABCABBDJAzoFCC4QgAQ6BAguEA06CAgAEB4QDRAFOggIABAeEAgQDToKCAAQHhAPEBYQCjoICAAQHhAPEBZQ6glYs6EBYIzAAWgCcAB4AIABmAGIAecOkgEEMi4xNZgBAKABAbABCg&sclient=gws-wiz
FYI GMT800 trucks have no chip in the key only in the tumbler assembly. Since the truck starts and quits its the VATs system. How to Reset the Passlock System on GM Cars Insert your key in the starter, start you car as you usually would and let it stall. Keep the key in the “On” position. … Wait until the “Theft Sys” light on your dashboard stays on without blinking. This will take approximately 10 to 15 minutes. Источник: https://gsi-alarme-securite.com/protection-of-life/how-do-you-reset-the-security-system-on-a-chevy-silverado.html
Federal emissions requirements includes vapor emissions from the gas tank and to eliminate it MFR's were required to go to returnless fuel systems to avoid circulating fuel and heating it up. Returnless systems in GM vehicles starting in or around 2003 eliminated the line fuel filter and added a larger lifetime of the pump filter since the fuel isn't circulated anymore. There are millions of vehicles all over the U.S using this system and many get 20000+ miles on a pump.
Did this on my 2001 Silverado and Corvette worked great. Found it here. https://www.ebay.com/itm/125182232515?chn=ps&_trkparms=ispr%3D1&amdata=enc%3A1wcaGUg3eRZqIxtn07chPiQ66&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=125182232515&targetid=1599090334937&device=c&mktype=&googleloc=9030162&poi=&campaignid=15275224983&mkgroupid=131097072938&rlsatarget=pla-1599090334937&abcId=9300697&merchantid=6296724&gclid=Cj0KCQjw29CRBhCUARIsAOboZbI2SCjmhHIgiTnvGsiz8pvFoPHeMWWKIoqtb8qZGxr1VjRiLefgfoQaAvilEALw_wcB
When SES is on the PCM goes to a default mode and retards timing and you end up with worse fuel economy and with the high gas prices do you or can you afford it. Almost every powertrain code results in deterioration of performance or economy. Dont drive around with a SES light on.
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