Washed my 2009 arctic white 6 speed standard C6 39,000 miles yesterday, took it for a ride and engine light came on.

Engine coolant temp got up to 216 f, checked it out after returning home.

Fan does not run. Any ideas where to start looking?

thanks. .....Jerry

 

What engine light? 216 deg shouldn't trigger anything.

Check fuses/relays related to radiator fan. Check plug down by fan for power on both sides....a burnt connector due to high current flow needed for full fan is a known issue.
There is also a PWM fan control box down there to check,

Cooling Fan Inoperative
Circuit/System Description
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 speed control module. The cooling fan control module varies the voltage drop across the engine cooling fan motor in relation to the pulse width modulated signal. The cooling fan speed is affected by many different conditions and can be adjusted from 10-90 percent duty cycle. Ninety percent is considered high fan speed. When multiple cooling speed requests are received, the ECM uses the highest cooling fan speed of all the requests. During normal fan ON operation, the control circuit voltage will be low and near battery voltage when the fan is OFF.

Circuit/System Testing
Important: The Circuit/System Verification must be performed first or misdiagnosis may result.

Ignition OFF, disconnect the connector from the cooling fan speed control module.
Ignition OFF, install a test lamp between the cooling fan speed control circuit terminal 6 and B+. The lamp should be OFF.
⇒ If the lamp is ON, test the cooling fan speed control circuit for a short to ground. If the circuit tests normal, replace the ECM.

Ignition ON, command the cooling fan speed from 0-100 percent with a scan tool. The brightness of the lamp should change with the commanded states.
⇒ If the lamp brightness does not change correctly, test the cooling fan speed control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

Ignition OFF, measure between the cooling fan speed control module ground circuit terminal 2 at the harness connector and ground for less than 1 ohm of resistance.
⇒ If greater than the specified range, repair the module ground circuit for open/high resistance.

Ignition OFF, verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.
⇒ If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

Install appropriately fused jumpers between the cooling fan harness connector terminals 1 and 4 power and ground. The cooling fan should activate at full speed.
⇒ If the cooling fan does not activate, replace the cooling fan.

If the ECM, fan, and all circuits test normal, replace the cooling fan speed control module.

 

Engine light. ...little light with pic of engine, nothing on DIC.

I have never seen a temp higher than 196 f. In Florida.

thank you for all the info, ...I will get to work.

 

There are hundreds of errors that trigger the engine light. You need to pull the code and research that.

Autozone for free. A $20 code reader to keep in car. A $100 scan tool that has more functions. $300 for a really good tool.

The coolant needs to hit 256 degrees before you get an overheating light. The radiator fan is not even commanded to HIGH until coolant hits 235 deg.

 

Check the fan plug. Common issue with some C6's. Fan plug overheats and melts.

 

Yesterday I just drove it three miles and flipped out to see 216 f. I have owned the c6 for ten years and never seen anything above 196 f and

that was climbing mountains, Usually 192 f.

I’m gunna take it out on the highway this morning and see if temps level or continue to rise.

thanks. ...Jerry

 

Fan plug

Clif

 

This was the primary reason why I just went through the overheating issues myself. The plug on my car was a puddle of goo inside.