Clean radiator, cool engine, coolant PH, flow, fans, shrouds.

Update on the citric acid flush.

The insides which I could see of the radiator were bright shiny brass.

Upon finishing the flush, I installed a stainless steel screen over the radiator inlet hose in cone shape.

The system turned out great by all appearances but things turned strange after sitting for a week. There was a loose hose clamp which was weeping between the rad and the hose, the fluid coming out formed yellow stalagmites of erroneous alien goop as it dripped. I suspect there was still residual acid or crap in the system so...

I took a look inside the radiator fill neck and the brand new 50/50 fluid had a grey water look to it. So, I pulled the hoses off and reverse flushed the system about 5 more times with tap water, filled and ran for 30 minutes with water, drained and repeated. Finally I filled it with 50/50 pre-mix and it appears to actually be running considerably cooler. We shall see what the future holds. Currently it has a 160 T stat (gotta pull the a/c compressor to switch to 180) but I have the cooling fans set to kick in about 190, so I get a feel for the cooling abilities as it idles and the frequency which the cooling fans operate.

Well, idling with a gentle breeze about 90 degree day and the hood open, the fans rarely kicked on. Totally scientific method of determining cooling improvement...

I took it out on some back roads and rolled it out all the way several times, brought it home and all appears just perfect. When driving it, it runs at quarter gauge, when idling it runs at half gauge. Still to come is the spin on coolant filter kit.