Cooling Issues

[ducky]

Truck temp climbs while not moving.

Under normal driving, the temps stay normal. But when I hit a stop light the temp starts to climb to 230ish degrees. Then goes back down under normal driving.

Replaced the Tstat with the same kind LS 160 degree tstat, and filled it back up with coolant (about 1 gallon of 50/50) and let it idle to see what it would do. After it started getting to normal operating temps, it slowly started climbing again. Shut the truck off and came inside to type this.

Any ideas?

[metalchips]

Electric fan or fans not coming on. Bad fan clutch, should hear it change in pitch when starting cold. Clutch turns harder when warm --motor off. Bad water pump.

No air movement when stopped is the clue.

[GraniteBlueNNBS]

i would say bad water pump at this point.... If you have e fans and they are coming on and it is still getting hot then i would look at changing the water pump with a new one..

[ducky]

electric fans that have always come on at the right temp. I have a toggle switch also to turn both fans on whenever I want. I can deal with a bad water pump. any other ideas?

[DBRODS]

Bleed thew air out of the system.. crack a front crossover tube bolt and let it push all the air out with it running.. Let it get a steady stream of coolant flowing out of it and go from there.

[ducky]

Bleed thew air out of the system.. crack a front crossover tube bolt and let it push all the air out with it running.. Let it get a steady stream of coolant flowing out of it and go from there.

Hey I was just about to text you! lol Ill check that today also. I was reading a thread that said air might be getting in also.

[ducky]

Let it spill out from the cross over tube while running. 2 different times, and temps slowly climbed..

[DBRODS]

its a POS. Sell it!!

[sprayedenali]

my buddies truck used to do this... then it stopped. so idk.

hope that helps! hahaha

[Chevy-Art]

I don't know if this will help, but I always raise the front of the truck to bleed the air out of the system.