Had a very small hairline crack in my bottom radiator hose which just left a few drops on the stone tray everytime I drove it so had it fixed by a reputable radiator place. While I was there I purchased their own Glycol radiator coolant (5lts - green). I was already running the $80 genuine Holden red Glycol for a couple of years and Temp idled at half and over half at traffic lights by about 2mm, so when I replaced this with the new Gycol I didn't mix it I put the whole lot in which nearly fills then Torana, topped up with demineralised water but then the dam car started to run hotter? over half when running in this cool weather and a good 3mm past the 180f mark on the gauge? So drove car to the radiator place today and manager looked under bonnet and says its not running hot even though 10 miniutes of idling it was showing 3/4 hot on the temp gauge? Never did this with the GMH red Glycol. Anyone gort any idea whats going on?