OK, so here are my recommendations: (1) Start by confirming your A1419 iMac is a Late 2012 27” with iMac ID 13.2. The following should cover all iMacs from 2012 through 2019 (2) Watch OWC’s removal/installation video here (OWC has been supporting Apple computers for DECADES) (3) I highly recommend purchasing OWC’s iMac tool kit ($25). You will need to remove the screen, and it is glued in place. Take your time and it will come off. I do not and have never worked for OWC, but I did work as an Apple tech for 17 years and after trying many companies’ parts, will only deal with OWC to keep my iMacs going. Take your time and it will all come together.

To the best of my knowledge, there are actually 3 versions of heater core used in the 2004-2007 Caravan (Caravan, Grand Caravan) and I believe the main difference is the location of the hose connections. While I did not take photos, the only steps I needed to do on mine were: Removed center dash cover (this is the section beneath the radio. 4 or 6 easily accessible Philips head screws) Drop the brake pedal down (very easy. Remember to remove the brake switch first) Remove the bolt on the steering column (basically splits the column into an upper and lower half. The top half stays in place and the lower half lays down (it is hinged). Remove the screws holding the hoses and heater core in place and slide the core out (I used some aluminum foil to catch antifreeze that dripped out while I put some plastic wrap over the hoses and hose connetions (plastic wrap held in place with rubber bands). Reverse the steps to reinstall. This video is pretty good, https://www.youtube.com/watch?v=RLa-GlVfTt4 Take your time &...