HI vetters,
I live in Phoenix where we of course have most days in the summer over the 110 degree mark. I have a 2006 that has been overheating and even hitting the max of 260 degrees. I have a magna supercharger on it so that may cause the car to run a little hotter. I really don't know. As in any city I spend a lot of time sitting at red lights. I took it in a couple of weeks to have it checked and of course the shop could not get it above 190. I don't really drive it much but yesterday I was running some errands and it was hitting 230+. So I took it back to the shop and left it running. It hit 260 while he had his computer plugged into it. Turns out it was a cooling fan motor and it also had a fried fan wiring harness. So they fixed the issues and I went home. But the car is still running at 230+ after a very short drive to the grocery store. Can someone please tell me what the issue may be? Or is this normal? The ac is blowing cool, but I think it could be colder.

 

What shop did the work? Did they also clean the road crap out of the intercooler, condenser, and radiator?

I'll get in the 230+ range in heavy rush hour traffic, in the heat of summer. It'll run in the 210-220 range in normal city driving, and 190-200 on freeways.

Try a freeway drive and a little normal street driving to compare. You'll probably be a little higher, but not much.

 

For a stock car here is how the cooling fan system works and what temperatures are reached before getting to the high speed fan operation.

Cooling Fan Control - Variable Speed Single Fan System
The engine cooling fan is a variable speed fan. The engine control module (ECM) controls the fan speed by sending a pulse width modulated signal to the cooling fan control module. The cooling fan control module varies the voltage drop across the cooling fan motor in relation to the pulse width modulated signal.

Cooling fan speed is effected by many different conditions and can be adjusted from 10 percent to 90 percent duty cycle (PWM), 90 percent is considered high speed fan. When multiple cooling fan speed requests are received the ECM uses the highest cooling fan speed of all the requests. The ECM commands the cooling fan ON under the following conditions:

• Cooling fan duty cycle starts when engine coolant temperature reaches approximately 95°C (204°F) and reaches high speed at temperatures above 113°C (235°F).

• Cooling fan duty cycle starts when A/C pressure reaches approximately 1100 kPa (160 psi) and reaches high speed at A/C pressures above 2480 kPa (360 psi).

• At engine oil temperatures above approximately 150°C (302°F) the cooling fan duty cycle will be commanded to high speed.

• At transmission oil temperatures above approximately 132°C (270°F) the cooling fan duty cycle will be commanded to high speed.

• After the vehicle is shut OFF if the engine coolant temperature at key-off is greater than 113°C (235°F) or the A/C pressure is greater than 1720 kPa (249 psi) the cooling fan duty cycle is set to 50 percent, low speed. If the coolant temperature drops below 110°C (230°F) and the A/C pressure drops below 1660 kPa (241 psi) the fan will shut OFF. The fans will automatically shut OFF after 2 min. regardless of coolant temperature.

The fact your fan harness connector melted indicates the fan may have been tuned to run at max duty cycle continuously. It isn't designed to be run that way and other people have melted their connectors. If you want to run the fan at that pace you will need to hard wire around the connector.

Bill