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if im in stop and go traffic my 05 silverados temp starts to rise, but if im cruising down a highway its fine. any help?
 

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Have you checked to see if your electric fans are turning on?
 

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I'm sure there is a better way but one way is after driving and you see the temp getting hot like you explained if you are in a place you can pop the hood and see if they are on. they are set to come on at a certain temp. like I said I dont know any other way (my truck has the clutch fan). I can usually hear them in my two cars that have e-fans
 

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This is outside of a fan problem. Have you changed from the red coolent yet? With the motor cool take off your radiator cap and look for gunk build up. The thermostat could be clogged up not letting it open or close all the way. I had a Chevy 305 that was missing the thermostat completely and it never got hot on the highway but was hurting in stop and go traffic. Coolent wasn't in the radiator long enough too cool down and coolent in the motor wasn't there long enough to absorb heat and pull it out of the motor. Make sure your sensor is working right and flush the coolent system and if that doesn't fix it, replace your thermostat. Almost forgot, the red coolent led to a massive recall due to it's corrosive attributes on intake manifolds and gaskets. Some vehicals may still be covered for repairs on this.
 
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