Yes. It's a GT. Now that I'm looking at it closer, it actually looks like the heater box has a tiny crack in the plastic. If I was to bypass it how would I do that? Just connect the two lines together? And if I did bypass it would I have to adjust the coolant level?
The heater core is not plastic, just the housing that it is in. Take the core out and have a radiator shop fix it. You can cap off the outlets to the water pump and thermostat, or connect the two hose ends and that will loop it.
So I decided to just bypass my heater core. When I took the hoses off, the upper one leaked out coolant which I expected. But when I took the lower one off it leaked out this weird black used oil looking stuff. Could it be that my core was clogged before and it’s really old bad coolant?