well i changed my overflow tank to a billet one with a 13lb cap since i have tubs on the truck. its a 06 gmc sierra 5.3. truck has been going past 210 basically between 210-260. tank is full. i disconnected the top small hose coolant came out from the tank not radiator. has anyone gone through this? thanks.

 

rev it to 3000 rpm for like to 2mins so it can get all the air bubbles out. if it start to over heat while doing the 3000 rpm revs shut off let it cold down restart it all over...

 

Ok ill try that. The temp goes up high the. All of the sudden its normal then it goes back up.

 

i had this issue and i realized one of my fans would stop working sometimes and it was just random

 

make sure your fans are working..check relays fuses, when your truck over heating make sure anytime your working with coolant to make the heater is on high.....

 

Make sure the coolant tank is above the radiator and engine to get the air out. The fluid does expand when it gets hot, so if you overfilled in the beginning it will bubble some out until its happy, thats pretty normal.

 

If everything's good with the tank, don't fight it, get one of these and be done.

 

Dang i want that just because ^^^^

I've never had an issue with this.
I just pull the small vent hose off of the top of the motor. Crank and let idle. Add water as needed.
Does your heater get hot?

 

Check for heat coming out of the vents. If it's super hot like normal, then you have NO air in the system. If it's barley warm or cold then there is air. The coolant resivor is below the hoses to the heater core. Which sucks *** for bleeding the coolant system. I would rev at 2-3 rpms for 2-3 min or until the heater out of the vents are hot. Then let off and fill full of fluid.

 

Everyone needs the spill free funnel. We call it a funnel buddy at the shops! So great and easy!