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Would there be any issues if I removed the thermostat from my 4d56 engine in my k74 l200?

dont remove it.. the vehilcle will take too long to reach up to operating tempreture.. why do you want to remove it?

im trying to isolate a problem....this is what happens, the temperature gauge stays at half or just below, but the thermometer goes up to 50 sometimes, and when the ac is on it only blows cold when the car is in motion or at night when its not so hot, once im at idle it gets warm.

I have this same exact issue. As long as the vehicle is stopped the temperature goes up to like 50+ and the ac begins to lose its coldness. Once driving the ac starts to blow cold again when the temperature begins drops from 50+

Sounds like the clutch fan is in need of some silicone oil. The fan doesn't spin much on idle and the temp goes up. Doesn't help the AC condenser cool down either.

^^You all are describing same problem my van is experiencing for a really long time now and I can tell you it is directly related to your A/C being on. The radiator is not cooling efficiently enough to compensate for added heat from a/c condenser fan. On a hot day at idle with A/C off temp would remain stable. But with A/C on it goes up in five minutes. It will cool great while in motion. Last week I had fan clutch serviced with silicone oil because I read this thread and tried static advice, but the problem is still there. Mechanic advised to do radiator flush or seek new rad. Hope this helps.

Got through with my problem and temp is stable enough in traffic on a very hot day. The radiator core needed cleaning.