So I swapped out my water pump, thermostat, installed an electric fan and I am overheating. The fan is working... I even turned it on manually and drove around and the temps still rise up.. I let the truck sit and idle with the cap off of the reservoir for about 20 min to get air out (thought that would be the issue) but nothing. I can let it sit on idle for 20 min and truck will not get hot. But right when I drive it for like 15 min temps go way up... Any ideas????