4 core radiator.....

[71MACH-1]

As stated before....

thus is only with the AC on. With the AC off it runs normal temp..

 

[Jeff73Mach1]

The AC Condenser throws off a lot of heat, increasing the incoming air temperature across the radiator. It may still be that the sending unit is inaccurate.

What fan and shroud combo is on your car?

 

[71MACH-1]

Factory shroud

5 blade fan

Deflector in place with homemade deflectors on sides and bottom

 

[Tnfastbk]

Clutch fan? If so have you checked that is is good?