it runs around 210 thats when i believe fan kicks on because it dosent really get any more hot is that to hot i swapped my engine out to a 73 carbed 350. if that matters.

 

Our cars are designed to run at 210-220*. the factory fans come on at 225*. If you say your fans come on at 210, then your gauge may be a little off. That's normal. Mine reads 20* off (reads hotter). If the fans are working and it never gets hotter than 210-220, your cooling system is running just fine.

 

so i checked and my dad hooked it up to the iginition is that bad how would i fix this he said temp sensor was out

 

Your dad hooked what to the ignition?

The sensor for the thermostat is in the drivers side head between the #1 and #3 cylinders (near the front). this one you can change from the top of the car however you'll need to drain the cooling system first.

The sensor for the fan to turn on is on the passenger side between the #5 and #7 cylinders (the back two). This one you'll need to get at from under the car and again, you'll need to drain the coolant first.

Both of these have wire's going to them. It could be that the wires are bad and need to be replaced. I would however, go ahead and change the sensors just to be on the safe side. The sensors should have a pigtail that comes with them.

 

hooked the fan itself up to ignition so its all ways on

 

That's not good on the highway, not as good anyway.

I'd try and get it running properly by hooking the wires up right and getting new sensors.

On the highway, having the fan running actually slows the air going through the radiator down and makes the car run hotter.