How to change the heater coreof bmw318 is 97

Start inside the vehicle on the drivers side, remove the drivers side bottom dashboard plastic panels, you'll need to pop out the switches on either side of the steering column to access the 10mm bolts that hold the plastic panel, and steel panel under it. Working directly in front of the console above the floor, by the firewall, will be a black plastic cover on top of another black plastic cover. They are held in by 5.5 mm screws. Once both panels are removed, you will finally see the heater core. There are 2 straps that hold the heater core in place. Remove the 5.5 mm screws that hold the straps to the housing. Now, from under the hood, around the center of the firewall, there will be a rectanglar shaped vacuum box mounted on top of a relay bracket, remove to 3 10mm nuts to move vacuum box and relay bracket out of the way to access the heater core hoses. It may help to, from the inside, push the heater core forward thru the firewall, and then from under the hood, cut the aluminum tubes a inch or so from the heater hoses, a long sharp edge flat blade screwdriver might help. You can do this from inside the car, but watch for anti freeze. Remove the hog ring clamps, vice grips might help, in removing them. Use alot of WD-40, by spraying between the hose and the tubing, use a thin screwdriver between the hose and tubing to break the seal of the rubber hose to the tubing. Remove the 2 tubing pieces from the heater hoses. You are ready to reassemble. I'd replace the clamps with some worm gear clamps, alot easier to deal with.