I did not think about bleeding the system. I just filled it up with 50/50 coolant and started it up. So I have to run it without the cap until it gets to operating temp but would air pockets prevent the thermostat from opening? I thought it was temperature that opened the thermostat. I looked and see there is a 160 thermostat name Failsafe, which is supposed to fail in the open position. They are twice as expensive as standard thermostats anyone used these Failsafe brands? How big of a hole is needed in the thermostat so it can bleed through?
