I have a 72 C10 with a SBC 350 (290 HP) running vintage air, FI tech fuel injection, 3 core aluminum radiator with full shroud and 2 ~12” electric fans. I also have a flowcool high volume/flow water pump and hi performance 160 degree thermostat. AND i also installed a spring in the lower radiator hose for good measure. All parts have less than 3500 miles on them. Timing is 15 BTDC and AF mixture is set with a target of 13:1.

Regardless of ambient temp, the truck runs at about ~175 degrees +/- 10 degrees at idle or at highway speeds. As soon as I turn on the ac, i can watch the temp gauge go up to 210+ and pegged siting at idle yesterday with the ambient temp at 80 degrees.
Looking for some advice or feedback that may be causing the temp to go off the charts with AC on. Thanks in advance.