Intro, and cooling system

Hello new here just saying hi, a littlle about the car. Its a Gen3 94 camry thats in decent shape, The body will need a coat of paint and rear bumper, and tail light center lens. The interior is really good just some general cleaning of the carpets and really everywere pretty dusty , and replace the sun visor driver side. The door outside handle doesnt work will have to replace that also. As far as the engine the odemeter reads 175K but the engine was replaced at about 90K due to the oil pump stopped working going down the interstate at 75 miles per hour, and it fryed the rings etc....
I have some work on the engine, mainly a oil leak from the front or passenger side front i should say. I am about to due a complete tune-up incuding timing belt full fluid changes etc.. but that will probably be a month or so.
The two pressing problems are the ignition that i just got fixed (thanks for the help here) and the cooling system. But overall not bad considering it was free in exchange for some networking work I did for a friends small buisness. Now to the cooling system--

It does fine on short trips about 10 miles or so, but over that the overheating problem begins. I've tried to pay attention to the details to provide as much info as possible---Generally if stopped at a redlight it climbs but only after you have been driving for while , but getting back on the gas it starts dropping back down. When going down the interstate it climbs when on the gas and when I lift off going down a hill it drops back down. The cooling fan didnt work But i unplugged the sensor so it stays on all the time and with the heater running full it helps a little. I Am going to try the cheaper way out first I picked up some antifreeze and a new thermostat this afternoon tom, I am going to remove the radiator and reverse flush it blow some air thru it and flush it again trying to rule out a clog. Flush the engine with water after removing the old thermostat. Then I'll put the radiator back in refill and see if that works. Before trying to replace the water pump even though it doesnt look that hard it does look time consuming and that is one thing i dont have a lot of right now. If you have any more ideas before I get started let me know so I can go pick up what I need before I dont have a way to get there. joys of having only one car. LOL, Once agian it doesnt happen at all on shorter drives just after I have been on the gas for a few miles it starts

The fact that the temperature climbs at highway speeds could indicate that the radiator is somewhat clogged. It simply can no longer handle the heat generated by highway driving. Your thought of flushing the radiator might help. It's worth a try. If not, you will probably have to replace the radiator. After all, the car does have 175,000 miles on it and you probably don't know the complete maintenance history of it. Just make sure the car doesn't overheat. Then you may be looking at replacing a head gasket or worse.

One more thought. If you do need to replace the water pump, do it when you are going to do the timing belt. This way you will have done most of the labor, since the water pump is under the timing belt.

Good luck with the car.

Mike

Update......
Got the ignition fixed with a cap, rotor, and plug wires. Got the cooling system fixed by flushing the system, and replacing the thermostat. Now I'll just clean the inside and go from there. Runs great! had the timing set at local garage just easier. thanks