Sharing my experience....
'66 389 +.090",
1) FlowKooler Cast iron HP water pump
2) Cold Case Radiator 15 1/2" Core
3) Factory shroud
4) 7-blade 17 1/2" Clutch fan - AMES P154FA
5) Hayden 2797 HD fan clutch
6) Robertshaw Hi Flow 160 degree t-stat w/ bypass hole drilled in flange.
7) Ram Air Restoration Billet Pulley Set
8) SPAL 12" Pusher mounted L side front of Condenser
95*+ is common here TX, extended time sitting with the AC on does result in engine temp creeping to 220*. Since adding the fan in front of the Condenser I have noticed the amount of time it takes to reach >217* has increased.
I have not done so yet, but may increase idle from 750 to 900 with AC on...
As the OP stated, the moment you start moving engine temp immediately falls back into the 180s.
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1966 GTO Resto-Mod. 2nd owner California car, Factory Air, Power Windows, Kauffman Heads, March Serpentine, Holley Sniper Quadrajet, MSD Dual-Sync, Gearstar 200-4R Level 3, Yank 2400 Stall Converter, Dutchman Axles, HGM Compushift Mini, Heidt's Tall Spindle, UMI Control Arms, Hellwig sway bars, CPP Big Brakes, AR Torque Thrust, Continental ExtremeContact Sport 02
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