Thank God for Chevy's

My 1985 M-B is worse. Owner's who've done it said a 3-day job to change the heater core. Rather than solid copper, it has crimped-on plastic sides which leak at the gasket. A new one costs >$500. Seems they built the whole car around the heater core. In my Chrysler minivan, the heater core pulls out an access door, for a 30 min job.