New LS3 start up but no water flow through radiator

[badazz81z28]

Originally Posted by dhutton

Are the fans turning on?

Don

A dewitt radiator has the fan trigger in the radiator, so unless it's flowing through the radiator, they won't turn on.

[Vegas69]

Coolant doesn't flow through the radiator until the t stat opens. If you temperature gauge isn't exceeding your t sat opening temp, you aren't running it long enough.

[randy]

yup i freaked out as well. I need up putting about 3 jugs in to finally fill everything up. Just go buy a cheap temp infrared gauge and point it to the thermostat. My guess is you dont have it hot enough yet

[vstol]

Thanks but temp in going past 210 to 240.

[Che70velle]

I wouldn't let it go that hot again. The infrared gun aimed at the tstat will give you an indication of a faulty gauge. If gauge is ok, you have a bad stat, or some kind of blockage, ie a shipping plug left on radiator inlet, etc.
Is the TStat a GM piece? It should open, and you should see water moving in radiator before 210. If not, shut it off.

[Vegas69]

Air pocket if it goes from 210 to 240 quickly.

[vstol]

Originally Posted by Vegas69

Air pocket if it goes from 210 to 240 quickly.

It does and I plan to elevate it tonight or tomorrow to see if I can get rid of it. Understand cap off?? Thanks

[Neil B]

Sounds like an air pocket. I've never had that issue on an LS, but my BMW did that after a water pump swap. It took several bleeds to get it fixed.