Cadillac Seville 94, heater coil and bushing replacement

U can bye pass the heater core by removing the 2 hoses that go into the a/c case. Then put a large bolt, old spark plug in the hoses and tight them up. This stops the flow to the core. To replace u need to remove the glove box and the under dash panel. Youll see the a/c case seam. There are bolts around the seam on the case. Then you will need to remove all and pull the case apart. It comes out the bottom of the dash. Then replace the core and reinstall everything. Front bushing?