If the heater core is done for can you bypass it somehow so you do not have to replace it just now?
Yes, you can bypass the core. Find the hoses to the heater core. Remove them from the core ... as a worst case scenario, cut them. Install a double male hose connector with clamps on the hose ends to complete the bypass fix. . John In Montana
Not necessarily. It depends on what you mean by a bad heater core. The core will either be leaking or stopped up. If it is leaking, then it can cause the engine to overheat and the only fix is to replace it. A clogged or plugged heater core can sometimes be fixed by flushing it. You can also temporarily bypass the heater core until you can get it fixed. Just connect the inlet & outlet…
You have to take out the whole heater and air condiasioning system out and replace the new heater core in. When you replace the heater core, you firset have to put the air condiasoning system in then the heating system/ heater core. When you take the old systems out, you first have to take out the A.C then the heater.