1993 honda accord running hot, changed thermostat

Hi,
Just use a normal DOT-3 brake fluid! Just always check the color and level of the fluid!
If it is dirty( black ) u need to drain the whole system and put in a new DOT-3 brake fluid!

Check the fluid level. Automatic transmissions won't go into gear without enough fluid. If it's low, you've probably got a leak somewhere that you need to find.

An intake gasket vacuum leak can cause this also. Sometimes you can isolate the problem by spraying carburetor cleaner at the head/intake mating surface while the engine is running. The fluid will cause a momentary stable idle when you find the right spot by plugging the leak. Could be a leaking vacuum hose too.

The first thing is to make sure the coolant is full, check it when the engine is cool, check radiator level, if coolant is full then check for bad thermostat, run engine and as it overheats check both hoses to make sure they are both hot, if one is hot and the other warm then you will need to replace the thermostat.if both hoses are hot then you may have a bad cooling fan or sensor, hope this is helpful.

You may have a cracked head, block or blown head gasket that is leaking combustion gas into the cooling system. If you dont have a combution leak detector kit you can take it to a trusted mechanic tell them the problems you've had and the parts you've replaced. Ask them to check for a combustion leak in the cooling system. A minor combustion leak in the cooling system can sometimes mimic the symptoms of overheating.

Check for a small leak in your radiator. Mine was leaking on top near the cap. Had a small crack which caused my temp to run hot.

Sounds like a thermostat or cooling system issue. Change the fluid and the thermostat. It will do your engine good so it's money well spent.

i would correct the leak before anything else and properly bleed system and go from there

most of the time it is where the outlet radiator hose attaches to the engine.

No only if you have noticed a change in engine running temperature on gauge, colder or hotter than normal.