Ok i think to be a bit mroe specific, what you are saying is when the engine is at full operating temperature or cold and squeezing the upper rad hose?
Well first the upper rad hose is and outlet not an inlet for coolant. The thermostat is released with heat and releases towards the upper hose as if you are low on coolant you would not get any as the pump could not feed off skimming the top of the rad.
So in order for a thermostat to release it is engineered to release in the flow or direction of the coolant not against it, since the nature of it is to open it would keep trying to shut it as the spring on it worn out and cause the engine to overheat .This is the reason why most cars that have a thermostat problem not working it tends to never get any heat while oveheating is from a pressure loss from a leak .
So if the valve is on the side of the upper rad hose and releases towards it how is it that one would hear the thermostat ever make a noise since you would be basically pressurizing that side of the thermostat which would only make it seat better so what difference would it make ,it is like pushing on a door that pulls out ?
Also how would you even hear a thermostat make noise inside an engine, sorry in all my years of fixing cars ,in college as a tech and at the and a nut at the track i have never heard a thermostat ever make a noise.
Holding an upper rad hose that is cold means 2 actual things, their either is not enough coolant or the thermostat hasn;t opened yet.
Since it is the upper rad hose you are talking about just open the rad cap pour some water in and it should be full.
Sorry to pick apart your theroies but they seem way off and in the wrong direction, correct me if i am wrong, but that is why i spelled it out for you.
Increasing the flow of coolant will decrease you temps such removing your thermostat, which is not recommened as the car needs to be a certain temp or you will be burning too muchgas as the engine is still in open lopp ecu running rich.
the fan is most common for not functiong at full speed.
or try a search and find out what all the other 92-93 owners found when they overheated like everyother ES of that vintage.