I swapped out the thermostat since I was going through cooling system, new heater aux pump etc. It is a new OEM one I drilled the bleed hole as well 1/16 bit. All clamps are tight and good to go. I tart the car after refilling coolant in the tank. Turn the HVAC heater on etc. The aux pump powers on and runs. The car goes past 195. The radiator fans do not kick on. The radiators are cool which explains no fans operating. There air and coolant spit coolant coming from LOWER bleed nipple not the top. Any suggestions, air in the system? What do you do with the bleed nipples leave them cracked until they both flow coolant?