Joined: Apr 2012
First up, 220 is not really overheating, and also, are you monitoring the coolant temp, or the Cylinder Head Temp PIDs? They are not equal and will show differing values. Coolant will always be lower than Cyl Head Temp because the head is where the fire is, coolant is only passing through.
Coolant temp of 200-225 is normal here in arizona where it gets to 115-120^F outside at times, on a really hot day with the A/C on i have seen 230^F on the coolant, I actually have an alarm set at 230^F, and i kick off the A/C if it goes off, which only happens occasionally, and only when stuck idling in dead traffic at a complete stop. In the winter months, even sitting in traffic, i rarely get over 217^F on Coolant Temp.
Now on the Cylinder Head Temp, I have seen as high as 249^F on hot days, especially if im really laying into it at random times. But there is very little documentation from Ford about what temps are acceptable or dangerous on the Cyl Head Temps, though common sense would indicate that since aluminum looses 1/4 of its strength at 300^F that we want to stay as far away from 300^F as possible. So I usually settle down if i see the cyl head getting up towards 249^F.
2007 Mustang GT Deluxe Edition 5 Speed - White, Red Shelby Stripes
Roush Intake, 322 LPH Fuel Pump, 3.55 Gears, Dana Spicer Aluminum Driveshaft, Magnaflow Race Series Axle-Backs, 91 Oct. Dyno Tuning
255/50/R17 NITTO 555s, Slotted Rotors
324 RWHP, 328 RWTQ - 9-1-2018
1996 Mustang GT Coupe Auto White
2004 Shadow Gray Convertible 4.2L V6
Pacesetter Shortys, 2.5 Duals, Deleted Cats, Custom 2.5 H Pipe, Flowmaster 40s
Auburn Posi with 3.27 gears, 0.5 Phenolic Manifold Spacer