I have a 2004 c5 .car has around 130k. I've put a brand new radiator,t stat ,waterpump in the car but it still seems to run higher than normal. Will run 210 to 220 driving and sometimes as high as 230 in stop and go traffic. Any ideas out there?

 

Completely NORMAL!!! That is NOT too hot as it is what GM designed it to run. IF,, you want it to run cooler, you need a lower T stat and have the PCM reprogrammed to turn the fans on sooner and run longer.

Bill

 

I'm new but the lower fan setting will not help unless your under 35mph as they will not turn on no matter how hot your car is. And a lower thermostat will not help in that one bit. Unless your running 180 all the time and want to run lower then that.

 

The low speed cooling fans are controlled by the PCM based on the following inputs:
The A/C system
The Engine Coolant Temperature (ECT) sensor
The Vehicle Speed Sensor (VSS)
The PCM will turn the low speed cooling fans ON when any of the following conditions exist at idle:
Certain PCM Diagnostic Trouble Codes (DTCs) are set
ECT above 104°C (219°F) will enable low speed fans
A/C head pressure above 1510 kPa (219 psi)
Once the low speed fans are turned ON by Engine Coolant Temperature, the PCM will turn the fans OFF when that temperature has dropped about 6°C (11°F) . If the low speed cooling fans are turned ON by high A/C head pressure, the PCM will turn the fans OFF when the pressure has dropped to 1034 kPa (150 psi) . The minimum ON time for the low speed cooling fans is 50 seconds .

When engine speed is above 3500 RPM for 12 seconds and the engine oil temperature is above 127°C (261 °F) , the low speed cooling fans will be turned ON.

HIGH SPEED COOLING FANS
The High Speed Cooling Fans are controlled by the PCM based on the following inputs:
The A/C system
The Engine Coolant Temperature (ECT) sensor
The Vehicle Speed Sensor (VSS)
The PCM will enable high speed cooling for both fans when any of the following conditions exist:
Certain PCM Diagnostic Trouble Codes (DTCs) set
ECT above 109°C (228°F)
A/C head pressure above 1551 kPa (225 psi)
Once the high speed cooling fans are turned ON by the Engine coolant temperature, the PCM will turn the fans OFF when that temperature has dropped about 6°C (11°F) . If the high speed cooling fans are turned ON by high A/C head pressure, the PCM will turn the fans OFF when the pressure has dropped to 1241 kPa (180 psi) . The minimum ON time for the high speed cooling fans is 26 seconds .

For component replacement, refer to Cooling System.

When driving/ cruising the engine should run close to what the thermostat is rated.

Thermostat Temperature Range Starts To Open 87 Degrees C
Note: 188 Degrees F
Fully Open 97 Degrees C
Note: 206 Degrees F

Make sure the front air deflector is in place and in good condition and there are no airflow obstructions to the radiator. If all checks out, the coolant temp sensor may be slightly out of calibration.

 

If its a stock radiator, TS, and stock fan settings, this is normal. These motors are engineered to run hot for emissions.

 

everyone is correct on this op. You are gtg

 

You can always stand to blow out the radiator and A/C condenser. I happen to have deleted A/C recently and upon removing the condenser (In front of the radiator) I found so much junk lodged in between I could hardly believe it. I had done what I though was a good clean up in the past, but its a wonder these things even pass air through it when you see how much gets stuck in there.

 

If those numbers scare you dont see my car temp you can have a heart attack....even 235 is normal is at that temp that the fans start ,,,,just be sure that your fans are working,,,but is normal ls engines are designed to run hot....