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It ended up being the thermostat gasket I put on was leaking. For the heating situation, I tested it with a thermometer and it seems like the gauge or sender unit is inaccurate, it was showing as 220 and kicking the fan on when the thermometer was at 160.

Ok, so I managed to get a housing, got it yesterday, and installed it. After that, I took it out for a test drive for about 30 minutes, it still hits 220 quite fast and don't seem to be cooling any better at 195 degrees, my next plan is to change the radiator since I already have an aluminum...

I found one, its a bit more rare than I expected

Yep, I was going to do that until I realized I scraped the surface where the thermostat gasket would go at. And don't worry, disasters are addicted to me 😂

Well, that didn't work, I tried drilling it out but looks like its still stuck, I may just drill a hole and use a nut and bolt

How does the housing come off? I figured that if I removed both of the bolts from both sides, it'll pop off, but the side closer to the driver side don't want to come off If I had the housing off, I'll be able to get my torch on it better and have a better grip with some pliers on a vice

Yep, I checked that, there's no bolt in the back

Snapped it while removing it, I used the biggest pair of pliers I possibly could and couldn't get it to bulge any

I'll message you if everything else fails

So that's what my plan was but it was too tight to squeeze an impact on it, so I put heat on it and used a breaker bar and then snapped the head

That's going to be one of the things I try, my next plan is to cut a slot with a Dremel in it and try a flathead on a breaker bar. If that fails, Im going to to sqaure it off and try a pipe wrench

Today I went to install the thermostat on the humvee and realize yesterday that I snapped the bolt head off, now I just got threads sticking out. The question is, can the whole thermostat housing on the engine be changed easily? Taking off the broken bolt is the last thing I want to do; I...