I have a 5.3 (only mod is cold air intake by spectre)
It runs hot half way on gauge and it used to be at the 1/4 mark !
I ve changed thremostat ( many times) new waterpump , rad flush , engine flush , but to no avail. I recently read that it could be my head gaskets. Anyone have a simaliar experence?

 

And at idle there is a bit of valve train noise from passenger side bank!

 

You need to find out how hot it's running, the factory temp guage sucks. You need to check it with a scanner. Do you have electric fans or mechanical?

 

Best lil tool out there.. gives you accurate temps and such. the factory gauge suck.

ScanGaugeII : Linear Logic - Home of the ScanGauge

 

Its been scanned , went to 285 should be around 180 i think

 

And the heat from motot forsure .

 

Sorry for my crappy spelling , screens cracked on my i phone , something else i have to fix today too!

 

Hum... 285 is just a wee bit high..

Id do a coolant test and see if you have any carbon in there.. that would let ya know if your looking at a head/head gasket issue.

 

I am confused, who are you? Are you refering to the original posters vehicle?

 

285 is cooking.