running hot

[bigcountryinsc]

I have 06 Chevy Silverado with 5.3 its running hot.I changed the t stat and water pump and its boiling out of reservoir.I put straight water just to test it out if.it never runs over 210 please help

[desrtrat]

did you burp the cooling system? may not of gotten all the air out.try burping it again... bad would be a blown head gasket, or cracked head(s)..clean your radiator by compressed air blowing from the engine out the front the core fins can get clogged with dirt, leaves, bugs. then flush out with a garden hose and nozzle..if no compressor, just use water. if still hot, pick up a block tester from a good auto parts store. will tell you if your getting exhaust gasses in your cooling system...

 

good luck

[bigcountryinsc]

I tried burping it but it boils the fluid out

 

And I put a gallon of 50/50 mix in it to

[Bad Bowtie2]

Are the electric fans coming on??