For a senior member you don’t get it. This is the line that goes to recovery tank. Please somebody else chime in.

 

Yep, that’s how a cooling system worked when I was a boy.

 

Are you there Z. I lived where it gets to 120- 125 every summer. Just moved to cold county. My hummer will be fine. Did you do some research?
I just know you are not listening, understanding the real facts. There is a orifice in factory radiators. What next z

 

Z, go gm website, called a recovery rank. Expansion take was when it was a expansion tank when I was a boy.

 

And they do operate a little different.

 

Your wrong, I was as hard headed as you you until I read GM bulletin, saw it for myself. Check on radiator inside 1/2 inch outlet right top of radiator outlet. Do yourself a favor don’t sleep until you figure it out. Silverado/Sierra forum is where I found pic. Pretty clear. And they are the same radiator my friend.. you have great stuff here , but your wrong.

 

Send me your email, I will send a pic inside rad 1/2 inch fitting

 

Here ya go

 

Like I said this is the 1/2 inch line, inside diameter,, from top right radiator to recovery tank. It has has a restrictor orifice. Facts are facts z. It’s not just hummer stuff. Are you still up for this?