1993 Saturn SC1 Problems with cooling system !

I would first replace your coolant temp sensor it's the bottom one with the two wire's going to it.Also make sure that the connector going to it isn't corroded if it is then you will have to replace the connector too.The sensor is only 10 make sure you get a brass tipped one the plastic tipped one's crack.Check and make sure your transmission fluid is full and red and doesn't smell burnt.Also what do you mean your transmission clunk's?When does it clunk?Do you have any trouble code's in the computer?What are the high and low pressure's of your a/c at idle?If your a/c clutch kick's on and it doesn't get cold i will need to know what the pressure's are to help you further with your a/c concern.

If the fan come's on with the a/c but not on it's own then you need a new coolant temp sensor like I said and to also check the connector for being corroded.I even posted a diagram of where the sensor was. That will take care of that problem. Your fan will turn on from 3/4 on the gauge to the tip of the red. It's really common for a bad coolant temp sensor on that model so I would just change it. Make sure the engine is cold and you will loose a little coolant. As far as a transmission service there is no pan to drop. It's like changing oil there is a drain plug and spin on filter. If the fluid is red then your ok you change the fluid every 30,000 mile's. If it shift's hard in every gear then most likely you have too much pressure in the forward gear's. That would most likely be the valve body. But you would have to test the transmission pressure.