its tricky but can be done. disconnect the lines on the engine side of the firewall.drain all the coolant...remove the lower trims on both sides of centre console and peel carpet back...some torx screws await you so get them out carefully...its a tight fit but the core can be pulled out the passenger side...have lots of rags or towels ready tho for the exra coolant that comes out of the lines....

Immaquiter" seems to know exactly how to do it. I've done it before it usually takes me about 1 hr or so. Good luck