Since this is "the" cooling thread,
I'll just dump some photos in here ... and let internet conjecture take its course.
Complete cooling system overhaul.
Leaky rad inlet, soldered up, t'stat change for temp testing records, and fresh catspiss poured in.
NEW RAD >> http://www.ebay.com.au/itm/PRO-3ROWS...sNY&rmvSB=true
3yrs out of date ... 2yr service life, Type B, "coolant"
Probably should have left it alone ... Seems nothings changed.
Radiator had a cupful of murky water come out, after it was stood on its ends for flushing.
2 cups of coffee hiding in the heater core, with clean heater hoses ... damn alloy heat exchangers ..
... and its a 97+ ... so no heater tap.
6plus yrs with out a 50/50 "coolant mix, and not a Stant product to be seen ... amazing ..
Still running one of those over rated alloy radiators ?? ... then probably best to use a "type A" coolant, with no less than a 25 or 30 % eth-gly qty.
If you dont look under your radiator cap at least 4 times a week ... make sure you change whatever liquid you're using ... by the due date .. or sooner