My son has a 2020 Trax the radiator had a leak at the seal between plastic tank and aluminum core. We replaced radiator has no leaks. But still overheats occasionally does anyone know if there is an air bleed for the radiator on these? I bought an aftermarket radiator and cannot find any type of bleed on new radiator. Is there one on the motor. I've been on all the forums and can't find any info on this. Thx for any help.