Iv got a problem with my cooling system but I don't know what. I went to flush and fill my system today. Draining the rad like from the plug like normal, flushed some water through it. And filled it with Prestone flush and water. Ran the truck forever. The top hose is hot but the flush seems Like it never left the reservoir. It was still cold. I drained the radiator and it was hot and that drained the reservoir. Few things iv noticed. My truck takes awhile to get up to temp. And the cooling fan turns on the second I turn the truck on. Am I doing something wrong?
Thank you