BMW Heater Core Removal, E46 3 series (No dashboard removal)

A guide on how to remove your heater core for replacement, flushing or testing. Also replacing the small O-rings that seal the heater pipes to the core. If you are having issues with no heat from the vents, Make sure all other Cooling system components are functioning properly and sealed. Air in the system / Leaking from the plastic heater pipes that run from the motor to heater core are the number 1 cause of no heat condition.