When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
You are mixing up the instructions, and confusing the term "flush". When you are circulating the VC-9, it needs to be driven for 1 hour. When you are just circulating water (without t-stat), it is 5 minutes in your driveway.
There is a difference of opinion around here on whether to remove the t-stat before using the VC-9. I say it should be removed, because I know it does not fully open until 219°F. It does not even start to open until 195°. I would rather have full circulation through the engine, even if it is at a somewhat reduced temp. And by the way, the workshop manual agrees with me. But whatever, I guess it will work either way.
I have donr it both ways and removing the thermistat for the entire process got it the cleanest. full circulation is the best and it does get pretty hot on high idle for an hour in the driveway I think it was cheezits post that i followed.