The gap for a 1995 4 cy. is .044".
Hey C==You really need gauges to be sure you don't overcharge the system. The low preasure outlet is by the accumulator. You charge it through this port. GoodluckJOe
The question you ask is too involved for a proper answer. You may want to go to a car parts store, or book store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
If it has electric fans? If so, are they coming on? If the vehicle has a mechanical fan clutch instead, maybe it quit working. If all this is good then-
Start with the thermostat. After changing it, and it is still having an issue with overheating, then the radiator will be suspect as being clogged, and will need to be flushed. Depending on the age of your vehicle, it may be a good idea to go ahead and have this done. And the only thing left would be the water pump. It is very rare, but impellers have been known to erode away (metal) and plastic ones have disentigrated, or fallen off their hubs.
Check your positive battery cablefor corrosion or a loose connection.If that's ok then you have a bad starter solenoid.